exam Maths Puzzle Numerical Ability

Translated to an algebraic expression the sum of a and 7 times b is
a+7b

true or false?

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exam Other Question

If x-y=6 and 3x(squared)+3xy-6y(squared)=60, then 9x+18y=? 5b+2(b+1)=16 can you help solve the equation. What is the formula?