book Maths Puzzle Numerical Ability

the length of the room is 5 feet more than the width of the room. the perimeter of the room is 70 feet.find the length and width of the room.

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book Other Question

The sun of two numbers is 64. Twice the lesser number is five more that the greater number. Find the numbers. Please show me how to do this.

sqrt20/5 - 1/sqrt5

Only the 20 in the numerator is in the sqrt in the first half and only the 5 in the denominator is in the sqrt in the second half.

Thanks