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ICSE Class 7 Answered

nita is three years younger than her brother mohan. 5 years ago, three fifths of his age was equal to three fourths of her age. What is their present ages now?
Asked by shirdhankarc | 09 Jan, 2019, 07:21: PM
answered-by-expert Expert Answer
 
Let Mohan's age = x years
 
Nita is three years younger than her brother Mohan.
 
Nita's age = (x - 3) years
 

5 years ago, three fifths of his age was equal to three fourths of her age. 

begin mathsize 16px style 3 over 5 open parentheses straight x minus space 5 close parentheses space equals space fraction numerator begin display style 3 end style over denominator begin display style 4 end style end fraction open parentheses straight x minus space 8 close parentheses end style

After solving above equation, we get

x = 20 years 

Therefore,  Mohan's age = 20 years and Nita's age = (x - 3) years = 20 - 3 = 17 years


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