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

سارہ اپنے سب سے چھوٹے بھائی سے دوگنی عمر کی ہے۔ اگر ان کی عمروں میں 15 سال کا فرق ہے۔ اس کے سب سے چھوٹے بھائی کی عمر کتنی ہے؟
Answer: 15
Explanation

Let Sarah age = x,

Sarah's brother age = y.

Given,


x = 2y ( Sarah is twice as old as his brother )

x - y = 15 ( Difference between age is 15 )


Solving these we get,

y = 15.

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