book Maths Puzzle Numerical Ability

In an isosceles triangle, the length of the third side is 25% of the length of one of the equal sides. Find the length of each side when the perimeter is 135 feet.

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book Other Question

Please solve and show all work. Thank you!

The sum of a number and its square is 12. Find the number.
Simplify the expression

(-3a^-3 b^7 / 2a^4 b^2)^3