Q.4. Ankit tells his daughter, “Ten years ago, I was seven times as old as you were then.
Also, five ye ars from now, I shall be four times as old as you will be."
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Answer:
Ankit's age = 115 years
daughter's age = 25 years
Step-by-step explanation:
present age of daughter ,let ,x
present age of ankit = y ,let
10 year ago
(y-10) = 7(x-10)
=> y - 10 = 7x - 70
=> y = 7x - 60 ......1
5 years from now,
(y+5) = 4(x+5)
putting value of y from equation 1
we get
(7x-60) + 5 = 4x + 20
=> 7x - 4x = 20+60-5
=> 3x = 75
=> x = 75/3
=> x = 25
y = 7x - 60 = 7(25) -60
y = 175-60
=> y = 110
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