exam Maths Puzzle Numerical Ability

Given f(x) = 2x + 5, find f(a - 1).
These are my choices
2a + 3
2a + 4
a + 6
a + 3

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exam Other Question

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? -2(x+6) + 3(2-x)