Algebra

Quantitative Aptitude (CCS)

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If 6x – 5y = 13, 7x + 2y = 23 then 11x + 18y = ?

-15

Explanation:

6x – 5y = 13 ...... (i)
7x + 2y = 23 ...... (ii)
By equation (i) × 2 & (ii) × 5,
12x – 10y = 26 ..... (iii)
35x + 10y = 115 ...... (iv)
by solving these equation we get
x = 3, y = 1
∴ 11x + 18y
= 11 × 3 + 18 × 1
= 33 + 18 = 51.

By: Amit Kumar

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