Problema Solution
Sam's mark for English was 18 less than his Maths mark, but 6 more than his Science mark. His average mark for the three subjects was 43. What was his mark for Maths?
Answer provided by our tutors
We can write:
Math mark: x
English mark: x-18
Science mark: (x-18)-6 = x-24
Therefore there averages can be written as:
[x+(x-18)+(x-24)]/3=43
Solving for x, we get:
x=57