Question

if (1/a)+(1/b)=10, what is the value of a+b
a) 1/10
b)2/5
c) 1
d)10
e)cannot be determined

Answer 1

it can't be determined:$$\frac1a+\frac1b=10\\\frac{ab}a+\frac{ab}b=10ab\\a+b=10ab$$

Answer 2

@oldrin.bataku so which one?
e?