Question

A fish tank contains 3 yellow fish, 2 white fish and 1 blue fish. What fraction of the total number of fish in the tank are WHITE?
(a) 1/3
(b) 1/6
(c) 2/3
(d) 2/4

Answer 1

Equation (1): o + k = 1x

Equation (2): s + 2k = 2x

Multiplying the first Equation by 2: 2o + 2k = 2x

Equation (3): 2o + 2k = 2x

substracting EQ.1 with EQ.2

2o - s = 0, and then s = 2o

Then, s/s+o = 2o/3o = 2/3

CORRECT ANSWER IS C