Primary 4 application questions

Let part A have x roots, then part B has (25-x) roots, then.

5x+8(25-x)=155, 5x+200-8x=155, 45=3x, x=15, 25-15=10 (root).

So there are 15 in Part A and 10 in Part B.

A is an x root, and b is a 25-x root.

5x+8(25-x)=155

Do the math yourself.

Column Equation System Solution:

A has x roots, and B has y roots.

5x+8y=155

x+y=25

The solution is x=15 and y=10

That is, A has 15 roots and B has 10 roots.

Let part A be the root of x, and part B (25-x) root.

5x+8(25-x)=155

Get x=15

A: 15 roots in Part A and 10 roots in Part B.

Let part A be the root of x, part B be the root of y, and the system of equations: x+y=25, 5x+8y=155, and solve: x=15, y=10. Substitute for the test, the answer is correct.

Let part A have x roots, then part B has (25-x) roots.

5x+8（25-x)=155

5x+200-8x=155

3x=-45

x=15a has 15 roots.

b has (25-x) = 10 roots.

The last row has: 38 + 2x (25-1) = 86 (pcs).

In total: (38+86)x25 2=1550 (pcs).

The last row is 38 + 2 * (25-1) = 86 seats.

38+86)*25 2=1550pcs.

10 minutes 100 meters from the return point.

Solution: Let x points meet.

310x+290x=6000

x=10 data return point distance.

When x=10, 3000-290x

A: The two runners met 10 minutes after the start. The meeting was 100 meters from the return point.

10 minutes 100 meters from the return point.

Let x points meet.

310x+290x=6000

According to the return point distance.

3000-290x

1.A bicycle can travel 45 kilometers in 3 hours, so how many kilometers does this bicycle travel in 5 hours?

45 3) 5 = 75 km.

2.The stationery store originally had 660 pencils, and after selling some, there were 300 left. Each box contains 12 pencils, how many boxes are sold?

660-300) 12 = 30 boxes.

3.Divide a bucket of milk into small bottles, each vial contains 200 ml, 30 bottles have been filled, and there are 5000 ml left unfilled, how many ml is the original milk in this bucket? How many liters?

200 30 + 5000 = 11000 ml = 11 liters.

4.Xiaoya's family uses an average of 53 cubic meters of natural gas per month, and if she needs to pay 2 yuan per cubic meter, how much does her family pay for natural gas a year?

2 53 12 = 1272 yuan.

5.Chubby wants to read a 300-page storybook, plans to read 10 pages a day, and actually reads 12 pages a day. How many days are actually less than planned?

300 10) - (300 12) = 5 days.

6.Xiao Gang's family has a box of moon cakes, each moon cake weighs 65 grams, and they ate 4 on the first day, which is exactly half of the left. How many grams does this box of mooncakes weigh?

65 4 (1+2) = 780 grams.

A, B, and C used the same amount of money to buy watermelons. When dividing watermelons, both A and C take more kilograms of watermelons than B. As a result, A and C each gave B dollars. How much is a kilogram of watermelon? Yuan.

All? It's all very simple!