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.Define variables, set up equation(s) and solve.

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exam Other Question

Business and finance.
The cost of producing a number of items x is given by C=mx+b, in which b is the fixed cost and m is the variable cost (the cost of producing one more item). Graph the solution set: 3x+5y>-15
x+3y>-6
x>-0,y>-0