Four numbers in the ratio 1 : 2 : 5 : 7 add to give a sum of 135. Find the value of the biggest number.
Solution
Correct Answer: Option D
Let each of these numbers be = a, 2a, 5a, 7a.
Hence, the sum of all the numbers = a + 2a + 5a + 7a
= 15a
It is given that, 15a = 135
⇒ a = 135/15
⇒ a = 9
it is given that 7a is the largest number.
Hence, the largest number is 7a = 7× 9 = 63
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