Mr. Joshi is four times as old as his son and the difference of their ages is 30. How old is each
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Let the age of Mr. Joshi's son be x and then age of Mr. Joshi equals to 4x.
Equation
4x-x=30
3x=30
x=10
Hence, age of Mr. Joshi's son is 10 years and that of Mr. Joshi is 4x i.e. 4×10 = 40 years
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