Question

the age od john and his father are in the ratio 4:7 after 4 years ,the ratio of their ages will become 3: 5 what is johns present age

Answer 1

hey friend,
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Let John's present age be 4x years
So, Father's present age be 7x years

A.T.Q.

=> 4x+4/7x+4 = 3/5
=> 5(4x+4) = 3(7x+4)
=> 20x+20 = 21x+12
=> 20x-21x = 12-20
=> -x = -8
=> x = 8

Therefore,
John's present age
= 4x years
= 4×8 years
= 32 years
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Answer 2

hello!
#ur Ans
________


let the age of John be 4x
&
his father age be 7x

so
$= > \frac{4x}{7x} \\ \\ now \: after \: 4 \: years \\ \\ = > \frac{4x + 4}{7x + 4} = \frac{3}{5} \\ \\ = > 5(4x + 4) = 3(7x + 4) \\ \\ = > 20x + 20 = 21x + 12 \\ \\ = > 21x - 20x = 20 - 12 \\ \\ = > x = 8$

thus
the age of John 4x = 32 years
age of his father 7x = 56 years

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