exam Maths Puzzle Numerical Ability

Ed has 100 dollars more than Robert. After Ed spends 20 dollars on groceries, Ed has 5 times as much as money as Robert. How much money does he have?

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Simplify: (27^(-2x))(25^x)^4(3^(6x))^1/2 / 9^x(625^(x-1)^-2 The perimeter of a triangle is 153 inches. The length of the longest side is 5/4 the length of the shortest side and the length of the other side is 10 inches more than the length of the shortest side. Find the length of each side.