12. The ratio between the present ages of P and Q is 3 : 4 respectively. If Q's present age is 20 years, what
will be the ratio of the ages after 5 years?
Answers
Solution :-
Given : The ratio between the present ages of P and Q is 3 : 4 respectively.
Q's present age is 20 years.
Let the present age of P = x years
According to the question,
=> x/20 = 3/4
=> 4x = 20 × 3
=> x = 60/4 = 15 years
Ratio of their ages after 5 years :
(15 + 5) / (20 + 5)
= 20/25
= 4/5 = 4 : 5
Hence,
The ratio of their ages after 5 years = 4 : 5
Answer:
Given
- the ratio between the present ages of P and Q is 3:4
- Q's present age is 20 years
let the age if P be x years
therefore by the given condition
x/20=3/4
x=(3/4)into20
x=(3into20)/4
x=60/4
x=15
therefore the present age of P is 15 years
after 5 years the age of P will be (15+5)
=20
and after 5 years the age Q will be (20+5)
=25
then the ratio of there ages after 5 years will be
20/25
=4/5
therefore ratio of there ages after 5 years will be 4:5
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