Question

Answer of both questions is (1),but I want explanation. Please answer with explanation I'll mark as Brainliest​

Answer 1

Answer:

1st ans explanation

Let the mother's age be 7x and her daughter's be 2x (5 years ago)

According to given condition

after 10 years from present

(7x+15)/2= 2x+15

7x+15=4x+30

3x = 15

x=5

Their present ages are

Mothers age =7*5+5 =40 daughters age = 2*5+5=15

2nd ans explanation

V is inversely proportional to 1/p

v= k/p

1140 = K/750 ( substituting values)

k= 750x1140

= 855000

P = 750+ 10 = 760

v= k/ P = 855000/ 760 = 1125

option 1 as 1140 -1125 =15 therefore decrease by 15 litres

hope it helped u

Answer 2

7. (x/x') = (y'/y)

x = 750

x' = 750+10 = 760

y = 1140

y' = ?

(750/760) = (y'/1140)

(750/760)*1140 = y'

y' = 1125

Change in Volume = 1140 - 1125 = 15 litres