book Maths Puzzle Numerical Ability

The first side of a triangle is 3 cm longer than the second side. The third side is 4 cm shorter than twice the second side. The perimeter is 31 cm. How long is each side?

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book Other Question
if the triangle area is 54 and the base is 12 then what is the height? In an endurance race, Alyson rode her bike 7 miles less than Jeff. Together they rode 39 miles. How far did Jeff Ride?