exam Maths Puzzle Numerical Ability

D=2M
M=B-4
B=D-17
What is the value of B?

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exam Other Question

. How many pints of a 9% cleaning solution must be mixed with 10 pints of a 13%
cleaning solution to give a 11% solution?
Please help to solve

square root of x + 2 = the square root of x +12