4
5
6
7
Correct answer is A
let the number be x
212x+34x=13
52x+34x=13
multiply through by 4
4(52)x + 4(34)x = 13 x 4
2(5x) + 3x = 52
10x + 3x = 52
13x = 52
x = 5213
x = 4
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