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If 3e+f3fe = 25, find the val...

If 3e+f3fe = 25, find the value of e+3ff3e

A.

52

B.

1

C.

267

D.

13

Correct answer is C

3e+f3fe = 25

= 3e + f

= 2 x 1

e+3f3ef = 5×32

= 3e+9f=1510f=17

f = 1710

Sub. for equ. (1)

3e + 1710 = 2

3e = 2 - 1710

310

e = 310 x 13

= 110

= e + 3f = 110 + 3×10 = 5210

f - 3e = 1710 - 3 x 110

= 1410

= 5210 x 1014

= 267