A rectangular park 70m x 60m has two roads each of width 8m, each running in the middle of it, parallel to the sides of the park. Find the area of the roads, and cost of
leveling the roads at the rate of Rs.15 per m2

the length of the park is 70m its width is 60m. The roads should have the same length so their area is 70m x 8m, =560m^2.

the cost of leveling the roads per m^2:

we have two roads so their total area is 560 x 2 = 1120m^2

now multiply this by Rs.15 to get the cost of leveling everything.

this is 1120 x 15

this gives Rs.16,800

36 girls

step-by-step explanation:

the 48 boys is 4 parts of the ratio

divide 48 by 4 to obtain one part of the ratio

= 12 ← 1 part of the ratio

3 parts = 3 × 12 = 36 ← number of girls