exam Maths Puzzle Numerical Ability

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.

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exam Other Question

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? find the slope of the line containing the following

1)(-1,6)and(0,3)
2)(12,-1)and(34,2)
3)(6,6)and(7,4)

THANKS A LOT VERY MUCH !!!!!!!!