If the sides of a parallelogram are in the ratio 3:4 and its perimeter is 84 cm, the longer side is:
Show answer & explanation
Correct answer: A
Explanation
Ratio of sides = 3 : 4
Perimeter = 84 cm
Perimeter = 2(a + b)
Let the sides be 3x and 4x
2(3x + 4x) = 84
2(7x) = 84
14x = 84
x = 6
Longer side = 4x = 24 cm