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SSC CPO Tier 1 Exam 10 Dec 2025 Shift 1

Section: Quantitative Aptitude

Question : 111 of 200

Marks: +1, -0

x :

y = 3

:4 then (7x + 2y) : (7x - 2y) equal to?

Solution:

Concept:

When a ratio is given, we assign a common variable to both terms to simplify calculations.

Explanation:

Let

x = 3k

and

y = 4k

(since

x : y = 3 : 4

Then

7x + 2y = 7(3k) + 2(4k) = 21k + 8k = 29k

And

7x - 2y = 7(3k) - 2(4k) = 21k - 8k = 13k

So the required ratio

(7x+2y) : (7x-2y) = 29k : 13k = 29:13

Answer:

D. 29:13

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