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08-04-2021
Mathematics

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Moosa's sister is six years younger than 3 times his age. The sum of their ages is 30. How old is Moosa?

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hnori22003 hnori22003

08-04-2021

Suppose Moosa is ( x ) years old ,

Thus Moosa's sister is ( 3x - 6 ) years old .

The sum of their ages is 30 :

( x ) + ( 3x - 6 ) = 30 ==》 4x - 6 = 30

==》 4x = 36

==》 x = 9

So Moosa is 9 years old .

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