exam Maths Puzzle Numerical Ability

a number is less than the sum of twice its oppisite and five. find the number

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exam Other Question

The lenght of a rectangular yard is 25ft more than its width. If the width were doubled, the area of the yard would be 1800ft2. Find the dimensions of the yard. Please help me solve 9x square/8y square divided by 3x/16y to the 9th power.
The answer is 6x to the 4th y to the 7th. I got 6xy to the seventh.