Book Maths Puzzle Algebra

The difference between two numbers is 15. Four times the smaller number plus twice the larger number is 120. What are the two numbers?

Read Solution (Total 1)

Let x nd y be the 2 numbers

x - y = 15 -->(1)
4y + 2x = 120 -->(2)

(1) * 2
2x - 2y = 30
2x + 4y = 120
****************
-6y = -90
y = 15
x = 15+15 = 30

X = 30, Y = 15
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