5th grade math application problem solving, math 5th grade pragmatism problem solving

If there are x girls and x 3 boys, then (x-3) = 7 8*x, x = 24, 24 girls and 21 boys, a total of 45 people.

1 1/8 = 7/8 1 3 24 (24 girls).

24 7/8 21 (person).

Boys are 21).

24+21 45 (person).

A: There are 45 students in Class 5 [1].

Because there are 3 more girls than boys, and there are one-eighth fewer boys than girls; So 3 people is 1 in 8.

Therefore: 3 1 8 = 24 [number of girls].

24-3=21 [number of boys].

24 + 21 = 45 [class size].

Because the 3 people born to boys are one-eighth of the total number of girls, the number of girls is:

Then there are 21 boys.

I hope to add points My answer is the most detailed, give a bonus point.

3 people account for 1 8 of girls, 3 * 8 = 24 girls and 24-3 = 21 boys, a total of 21 + 24 = 45 people.

There are x number of female students and 7 8x male students.

Female x-7 8x=3

1/8x=3

x = 24 males 24-3 = 21.

Hello: Solution: Set the little fat home x meters away from the school.

x÷60－4＝x÷80＋4

4x－240×4＝3x＋4×240

4x－3x＝960＋960

x＝1920

Solution: Set up Xiaopang's house x meters away from the school.

then by the title x 60-4 = x 80 + 4

The solution is x = 1920 meters.

A: Chubby's home is 1,920 meters away from the school.

From school to home x m x 60 -4 = x 80 +4 x = 1920 m.

Hello: Solution: It takes t minutes to set up a little fat house to get to school.

60x(t+4)＝80x(t-4)

60t+240＝80t-320

560＝20t

t 28 minutes.

Distance: 60x(28+4)=1920 meters.

The original planned binding number per hour was 1800 10 = 180 copies, but the actual binding number per hour was 1800 9 = 200 copies, so the actual hourly loading was 200-180 = 20 more than planned.

Assuming that x kilograms of oxygen can be produced per square meter of grass per week, then.

5x=x=Therefore, kilograms of oxygen can be produced per square meter of grass per week.

Originally made 400 sets of cloth for students, now make one set of cloth for students, so the original 400 sets of cloth for students can now make 1120 sets.

Solution: Let the pear have x kilograms.

x+300=2(x+20)

x+300=2x+40

x = 260260 + 300 = 560 (kg).

A: 560 kg of apples and 260 kg of pears were shipped.

Apple-pear = 300 kg

Apple 2 — pear = 20 kg

Simultaneous equations: apple = pear + 300

Will substitute for get.

Pear = 260 kg.

Then apples = 260 + 300 = 560 kg.

Solution: Let the pear have x kilograms.

x+300=2(x+20)

x+300=2x+40

x = 260 apples = 260 + 300 = 560 kg ] A.

, the third number is because this represents the sum of the first three numbers, the sum of the last three numbers, and the sum of the five numbers, which is just more than the vertical sale. Hope you are satisfied!

Answer: The number of sales in this row is a loss.

Heaven is crazy for me] liquid change, limb bridge hello: starvation.

The third number is:

Repentance should be the first thought, I have forgotten it, I hope it's right. Clarity and emptiness.

1.The distance of a round trip is 1, and the speed of the two boats is actually 1 8, and the speed of the two ships is actually 1 8, and the speed of the two ships is 1 10 When the two ships depart at the same time again, the difference between the distances traveled must be exactly equal to the distance of a round trip (of course, it can also be two, three round-trip distances, but the question requires at least) So: time distance speed difference.

Time 1 (1 8 1 10) 40 (days) The line segment is restored and the verification is correct

2.The area to be painted by a teacher is 12*8+12*4*2+8*4*2-28=96+96+64-28

228 (sq.m.).

Raw materials required 228*kg).

3.The volume of the apple The volume of water after putting in the fruit The volume of water before putting in the fruit 2*

cubic decimeter) 1 liter 1 cubic decimeter.

2 5 + 5 12 = 20 60 + 24 60 + 25 60 = 69 60 (hours).

One hour 60 minutes.

So it's 69 points.

+2=8 8+2=10 is to find the least common multiple of 8 and 10, that is, 40, so at least another 40 days for the two passenger ships to set sail on the same day.

2. Use the formula for the surface area of the cuboid:

But the topic is too vague.

cubic decimeters. 69 points. So he used 69 points, which is 1 and 3 20 hours.

1. The period of the first ship is 6+2=8 days.

The period of the second ship is 8 + 2 = 10 days.

The least common multiple of 8,10 is 40

At least another 40 days.

2. A classroom should be painted 2*(12*4+8*4)+12*8-28=228 square meters.

So the shared paint: 228*20*

3. liter = cubic decimeter.

The height of the water is dm

After putting in the apples, the water rises: 2-11 6=1 6 dmApple volume: 2* cubic decimeters.

3+2 5+5 12=23 20=hours=minutes.

1.The two passenger ships rest for 2 days, so in fact the actual round trip time for one passenger ship is 8 days, and the other ship is 10 days. If you set sail on the same day, find the same multiple of 8 days and 10 days of the round-trip time of the two ships. The two ships set sail on the same day 40 days later.

2.[2x4x8) + 2x (12x4) + 12x8-28] The floor is not painted, so it is not needed).

3.4.60x1 3+60x2 5+60x5 12=69 (minutes) 6 plus 3 20 hours were shared.

1.It took 60*1 3=20 minutes to do the first three questions, and 60*1 15=4 minutes to do the fourth question, so 30-20-4=6 minutes should be used for the fifth question.

2.There are 52-14 = 38 students who participated in the interest group, and 27 + 18-38 = 7 students who participated in both groups.

3.It should be a loss, so it should be painted per square meter, so a total of 85 * 2 3 = 170 3 = 56 and 2 3 are needed

1.60-1 3*60-1 15*60=4 minutes.

2.Because 14 people did not participate in the interest group, the actual number of participants was 38 people, and someone in the art group and sports group repeated the calculation once, so the number of people in the two groups and the actual number of people + the number of people who participated = 45, minus 38, get 7. There were 7 students in both groups.

3.Because there is a loss of 1/10 when actually painting, it is actually necessary to paint liters and liters per square meter.

1. Half an hour = 30 minutes; 1/3 of an hour = 20 minutes; 1/15 hour = 4 minutes; 30-20-4 = 6 minutes.

14=38 people attended the event; 27 + 18-38 = 7 people participated in both 3, liters.

Hours = 20 minutes 1 15 hours = 4 minutes.

30-20-4 = 6 minutes.

2.(27 + 18) - (52-14) = 7 people 3Litre.