book Maths Puzzle Numerical Ability

One number is 2 Times another. If you subtract 10 from each number, the sum is 40, what are the numbers?

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book Other Question

how do you solve:
(x+5)-(x+6)
Let f(x) = 2x^2 - 4x + 1 and g(x) = 3x + 2 and evaluate each of the following:

g(f)

f[g(0)]

f[g(1)]