exam Maths Puzzle Numerical Ability

44. One number is 12 more than another. The sum of the smaller number and twice the larger number is 39. Find the larger number.
A) 5
B) 7
C) 17
D) 34
I really appreciate your help!!!!

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exam Other Question

not in book.

Use the formula h=-16t^2+250t to model the height h in feet of a model rocket t seconds after it is launched.Determine when the rocket will reach a height of 900 feet.

Help please.
i factored this quadratic expression completely, and came up with the answer and roots of the expression. My answer is 6(x^2 + 5), root of 20. The problem is 6x2 - 42x + 72. Please tell me this is correct?