Two mixtures of clay and sand contain 40% and 70% sand by weight. When both the mixtures are mixed, the resultant mixtur

[Vincen]

Two mixtures of clay and sand contain 40% and 70% sand by weight. When both the mixtures are mixed, the resultant mixture is 700 gm. If the resultant mixture contains 45% clay by weight, then what is the weight of the first mixture?

A) 254.5 gm
B) 300 gm
C) 350 gm
D) 445.5 gm
E) 583.3 gm

Answer: C

Source: e-GMAT