exam Maths Puzzle Numerical Ability

One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.
5
7
17
34

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exam Other Question

Simplify each complex fraction:

A: [1+(3/4)]/[2-(1/8)]

B: [2+(x/y)]/(4/y) The demand equation for a certain type of printer is given by D= -200p + 35,000
The supply equation is predicted to be S= -p^2+400p-20,000
Find the equilibrium price.