exam Maths Puzzle Numerical Ability

If John cleans a house in 8 hours and Julie cleans a similar house in 6 hours, how long should it take them to clean another similar house working together?

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I need to solve the following problem and show the equation used for the solution.

Jill has $3.50 in nickels and dimes. If she h The 2nd side of the triangle is 3 times the 1st side. The perimeter of the triangle is 144 inches. Find the length of each side.