A couple has two sons. The sum of their ages at the time of birth of the youngest son was 60 years. At present their average age is 20 years. So how old will the youngest son be after five years?
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Answer:
Let,
Son = Y
Man = X
(X+Y)/2 = 35
Which means
X+Y = 70 Now,
X/Y = 5/2
Which means the sum of their age (70) is sum of a multiple of 5 + multiple of 2
x = the common multiple
5x + 2x = 70
7x= 70
x=10
Hence 2x = 20 which is son's age
Step-by-step explanation:
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