Akbar, Ali and Arman are 3 brothers. The ratio of Akbar's age to Arman's age is 1 : 2 and the ratio of Akbar's age to Ali's age is 2 : 5. If the eldest boy is 10 years old, how old is the youngest one?
+15001 Akbar, Ali and Arman are 3 brothers. The ratio of Akbar's age to Arman's age is 1 : 2 and the ratio of Akbar's age to Ali's age is 2 : 5. If the eldest boy is 10 years old, how old is the youngest one?
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\(ak:ar=1:2\\ ak:al=2:5\)
\(5ak=ar\\ 5ak=2al\\ \color{blue}5ak=2al=ar\\ \)
Arman is 10 years old, Akbar is 2 years and Ali is 5 year old.
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