Three quarters of a number added to two and a h... - WAEC Mathematics 2014 Question
Three quarters of a number added to two and a half of the number gives 13. Find the number
A
4
B
5
C
6
D
7
correct option: a
let the number be x
2(\frac{1}{2}x + \frac{3}{4}x = 13)
(\frac{5}{2}x + \frac{3}{4}x = 13)
multiply through by 4
4((\frac{5}{2}))x + 4((\frac{3}{4}))x = 13 x 4
2(5x) + 3x = 52
10x + 3x = 52
13x = 52
x = (\frac{52}{13})
x = 4
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