felippemed wrote:

Last year Roger, Shelly,and Terry each contributed money to a certain charity. If Terry contributed $50 more than Roger and Shelly combined, how much did Shelly contribute?

(1) The total amount contributed to the charity by these three people last year was $350

(2) Roger and Shelly contributed equal amounts to the charity last year

Let R+S = x...be their contribution combined

Given T = 50 + x

Stat 1: T+R+S = x+50+x = 350 => x =150.

R+S = 150...but we can' exactly say the S value...Insufficient..

Stat 2: R = S..

Then 2S = x..from question stem....we don't know the x value..

Both : x +50 +x = 350 => x = 150.

2S = 150 => S = 75.

Option C is correct answer..