Question:Anshul got twice as many marks in English as in Science. His total marks in English, Science and Maths are `180`. If the proportion of his marks in English and Maths is `2 : 3`, what are his marks in Science ? 

A `15` 
B `30` 
C `60` 
D `90` 

+ Answer
B 

+ Explanation
`E = 2S, E + S + M = 180`

`iff E + 1/2E + M = 180`

`:. 3E + 2M = 360` and

`E/M = 2/3` or `M = 3/2E.`

`:. 3E + 2 xx 3/2E = 360` or `E = 60.`

`:. S = 1/2E = 1/2 xx 60`

`= 30`.

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