If the digits A, B and C are added, the sum is the two-digit number AB as shown. What is the value of C? A
B
+ C

AB

it's equivalent, so we can say that its equal.

let's call the denominator x and the numerador is 18 less then denominator, x - 18.

multiply

2.x = 5.(x - 18)

2x = 5x - 90

90 = 5x - 2x

90 = 3x

x = 90/3

x = 30

so:

i believe it's a.

i'm not sure on this one, most likely correct.