Data Sufficiency

ss

Let x be the 1/2 gallon cartons osold and y be the 1/4g cartons sold

Question stem : x+y = 300

Stmt I

Store sold 120 1/4 gallon cartons

Therefore 180 1/2 g cartons sold

From here we can find the number of gallons (120*1/4+180*1/2)

SUFF

Stmt II

Store sold 90 gallon in1/2 gallon cartons

1/2x=90 => x=180

120 1/4 gallon cartons sold

From here we can find the numbe rof gallons sold

SUFF


D)

P.S.

Stmt I 1/4g carton quantity was given and in statement II quantiy(gallons) of milk sold in 1/2g cartons was given. From either we can get to the number of gallons.