exam Maths Puzzle Numerical Ability

The gym is 21 years newer than the auditorium. the gym is also one fourth as old as the auditorium. How old is each building?

(26,27,28) possible ages for auditorium

Write an equation as well as solve.

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exam Other Question
The cost of producing a number of items x is given by
, in which b is the fixed cost and m is the variable cost (the cost of producing one more item).


(a) If the fixed cost 1. find the product
(2x+5y)^4

I know that it is
1 4 6 4 1