# Math Help - how do i solve this kind of math problem?

1. ## how do i solve this kind of math problem?

hi

does anyone know how to solve these kind of maths problem

12/r1 = x+0.29
12/r2 = x+0.19
12/(r1+r2) = x

please help. and also if possible tell me these kind of question what is the name of the way to solve.

i seems to see alot of these kind of problem lately

2. Originally Posted by neonick
hi

does anyone know how to solve these kind of maths problem

12/r1 = x+0.29
12/r2 = x+0.19
12/(r1+r2) = x

please help. and also if possible tell me these kind of question what is the name of the way to solve.

i seems to see alot of these kind of problem lately
just put that $x= \frac {12}{r_1+r_2 }$ in first and second equation, than just solve 2 equations with 2 unknowns ...