plz help me............?

Question

three brothers are 5,10, 15 years old.their father leaves Rs 80,250 in a bank;paying 5 percent simple interest .if each gets the same amount at the age of 20,find their shares at the time of fathers death?

Answer 1

a=p+i
1.75a=1.50b=1.25c
a/30=b/35=c/42
a=80250*30/107
a=22500
similarly
b=26250
c=31500

Answer 2

x+y+z = 80,250

The above answer is correct. I forgot what simple interest was.

Otherwise, compounded annually, you get:

x(1.05)^15 = y(1.05)^10 = z(1.05)^5
2.08x = 1.63y = 1.28z
z = 1.62x
y = 1.28x

x + 1.28x + 1.62x = 80,250
x = 20577
y = 26339
z = 33335