Ali is twice as old as her youngest brother. If the difference between their ages is 15 years. How old is her youngest brother?

A) 10

B) 15

C) 20

D) 25

Ali younger brother age = x

                              Ali age = 2x

Given Condition:

                               2x-x = 15 

                                     x= 15

so younger brother age= 15

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