exam Maths Puzzle Numerical Ability

There are three prizes. The value of the second prize is five-sixths the value of the first prize. The value of the third prize is four-fifths the value of the second prize. I have

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one number is 12 more than the other. The larger number is 7 times the smaller number. Find the number.

thank you very much in advance!!!. Please help me solve this word problem!!!

A market researcher predicted that the profit function for the first year of a new business would be P(x)=-0.3x^2+3x-15, where x is bas