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Home / Aptitude Tests / Mathematics / Given that \(\frac{\...

Given that 3+55 ...

Given that 3+55 

= x + y15, find the value of (x + y) 

A.

135

B.

125

C.

115

D.

15

Correct answer is C

3+55  = x + y15

cross multiply to have: 35 =  x5 + 5y3

Collect like roots :   x5 =  5 → x = 1

                                5y3 =  3 → y = 15

∴ ( x + y ) = 1 + 15

= 115