Three containers A, B and C . . .

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Three containers A, B and C . . .

by Vincen » Wed Sep 27, 2017 6:40 pm
Three containers A, B and C have wine concentrations a, b and c, respectively, such that a > b > c. If quantities p, q and r , of wine are taken from the three containers A, B and C, respectively, and mixed, is the concentration of the resulting mixture greater than b?

(1) a − b = b − c
(2) p > q > r

The OA is C.

I don't know how can I solve this DS question. I think it is hard. Experts could you help me.
Source: — Data Sufficiency |