The average height of three kids is 56 cm and their heights are in the proportion of 7 : 8 : 9. Find the heights of all the three.

42 cm, 48 cm, 54 cm 56 cm, 64 cm, 72 cm 35 cm, 40 cm, 45 cm 49 cm, 56 cm, 63 cm

49 cm, 56 cm, 63 cm

Let's assume height of kids are 7x, 8x & 9x So, 7x + 8x + 9x = 3 x 56       24x = 56 x3          x = 7 Accordingly, height of kids are 49, 56 & 63.