The respective ratio between the present age of Ram, Rohan and Raj is 3 : 4 : 5, If the average of their present age is 28 years then what would be the sum of the age of Ram and Rohan together after 5 years?
The respective ratio between the present age of Ram, Rohan and Raj is 3 : 4 : 5, If the average of their present age is 28 years then what would be the sum of the age of Ram and Rohan together after 5 years?
A45 years
B55 years
C52 years
D59 years
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Corrent answer is: 59 years
Explanation:
Let the present age of Ram. Rohan and Raj be 3x, 4x and 5x years respectively.
\(3x + 4x + 5x = 3×28\)
\(= 12x = 84 \implies x = \frac{84}{12}=7\)
Sum of the age of Ram and Rohan after 5 years
\(= 3x + 4x + 10 = 7x + 10\)
\(= 7×7+10 = \text{59 years}\)
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