Math Itinerary Questions How to Answer I Want Answers and Process 10

Let the automatic operation be x days, and the manual operation is x+13 x (x+13)=1 14 x=1 is 1 day for automatic operation, and 1+13=14 days for manual operation.

The second problem is still simple to solve with chickens and rabbits in the same cage. Group 2 (680, 20%-118) (20%-15%)=360.

The first group is 680-360 = 320.

The third question is less conditional.

14-1 (1+120%) 30=4 11 Originally accepted the processing task 32 4 11 14-32=1200 pieces.

It turned out to be 1200 30 = 40 pieces per day.

Solution:1. If it takes x days for automatic operation, it will take (x+13) days for manual operation.

x/（x+13）=1/14

Solution x=1

x+13=14 (days).

A: It takes 1 day for automatic operation and 14 days for manual operation.

2.If the first group was originally planned to produce x pieces, the second group was originally planned to produce (680-x) pieces.

x(1+20%)+680-x)(1+15%)=680+118 to get x=320,680-x=360

A: The first group originally planned to produce 320 units, and the second group originally planned to produce 360 units.

1. Set manual to x, automation to x 14

x-x 14=13 gives x=14

It takes 14 days for manual work and 1 day for automation.

2. Set up the first group originally planned to produce x, then the second group originally planned to produce 680-x20% * x + 15% * 680-x) = 118 x = 320 the first group 320 and the second group 360

Clause. The third or fourth questions are wrong, it should be that you sent the wrong questions.

The time spent sailing along the water is equal to two-thirds of the time spent sailing against the current.

So the velocity of the water: the velocity of the reverse water = 3:2

Downstream speed = water purification speed + water speed = 20 + water speed.

Reverse water velocity = water purification velocity - water velocity = 20 - water velocity.

20 + water velocity) :(20 - water velocity) = 3:2

So, water velocity = 4

Downstream velocity = 20 + 4 = 24 km hours, that is, the speed of traveling 24 km per hour along the river is V, then B's speed is 5V 7

ab distance. Traveling in the same direction, the distance difference = ab distance = 6v 7

Speed difference = v-5v 7 = 2v 7

Catch-up time = (6v 7) (2v 7) = 3 hours: It takes 3 hours for A to catch up with B.

1.Solution: Sailing against the current Sailing with the water (the same distance) Time 3 2

Speed 2 3

Downstream velocity = hydrostatic velocity + water velocity flow.

Backwater velocity = hydrostatic velocity Water flow velocity.

Solution: Let the water velocity be x kilometers per hour, 20 x = 2

20+ x 3

3(20－x )=2(20+ x)

x=42.Solution: Dog rabbit.

Stride size 3 2 (because the hound's stride is large, it runs 2 steps, and the rabbit runs 3 steps).

Step 3 4 (The rabbit moves fast, the hound runs 3 steps, the rabbit can run 4 steps.) ）

Speed 3 3 4 2

Distance 9 8 (The speed ratio of hounds and rabbits is 9:8, so the ratio of distance they travel in the same time is also 9:8,).

Solution: Let the hound run 9x meters to catch up with the rabbit, 9x=8x+10

x=10 9 10=90 (m).

1.Solution: Let the water flow velocity be x kilometers per hour.

Then (20+x) (20-x)=3 2

Solution: x=4

Then travel 20-4=16 kilometers per hour.

Algebra: 20 (2+3) 4=16 km Hour 2Solution: Suppose it takes x hours for A to catch up with B, as follows.

Ratio of time = 1 ratio of velocity.

That is: x solution gets: x=3

A: It takes 3 hours for A to catch up with B.

If the velocity is x, then the velocity against the water is two-thirds x

x + two-thirds x = 20x2 = 40 So x = 24 (2) so that A's velocity is x, then B's is 5x 7

So the distance difference is 6x 7

The speed difference is 2x 7

So time 6x 7 divided by 2x 7 equals 3

So less than 3 hours.

1. Set the water flow to V

20-v)/(20+v)=2/3

v=4 Therefore: 24 km h of downstream.

2. If A is x, then B is 5x 7

According to the inscription, the total distance is (x+5x 7)*

Time = distance speed.

x+5x 7)*hours.

1. Set the water to travel x kilometers per hour, and the water flow speed is a kilometer per hour 20 + a = x

2--x20-a=3

The solution is a=4 x=24

If you only ask about the distance between the home and the library, it is 4500 meters. Because Y represents the distance between Xiao Ning and Xiao Qiang, one was at home and the other was in the library at the beginning.

Your topic does not match the graphics, and there are too many people in the title, so first unify the names of the people.

The whole journey is 7 + 11 = 18 parts, A traveled a total of 7 3 = 21 parts, 80 kilometers is the distance of 21-18 = 3 parts, and the whole journey is 80 3 18 = 480 kilometers.

Let the distance be l, and the speed of A is 7x, and the two people share the same time, then l 11x+(l-80) 11x=l 7x+80 7x is simplified, so that the denominator is the same to get l=216 km.

Solution: Let B's velocity be x m-hours, then A's velocity is (x+1) m-h.

A's velocity time + B's velocity time = total distance.

x+1）×（40/60+

x m hours).

The velocity of A is (x+1) = meters and hours).