exam Maths Puzzle Numerical Ability

Brad is nine more than two times as old as Ben. In 15 years the sum of their ages will be 96. How old is Brad now?

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exam Other Question
Complete the following statement x^2+13x+42=(x+6)( ) Given f(x) = 2x + 5, find f(a - 1).
These are my choices
2a + 3
2a + 4
a + 6
a + 3