7. पिता एवं पुत्र के आयु का योग 40 वर्ष है। यदि पिता के आयु पुत्र के आयु के आयु तीन गुणा है तो दोनो के आयु ज्ञात करें।
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Explanation:
let the age of father = x
the age of son = y
according to the question
x+y=40. (1)
x=3y
x-3y=0. (2)
by elimination method
x+y=40
x-3y=0
- +. -
= y=10
put the value of y in eq (1)
x+y=40
x+10=40
x=40-10
x=30
so the age of father is 30year and his son is 10 year old.
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