The average height of four pupils is 123 cm. If the average height of three pupils is 140 cm, find the height of the fourth pupil.
| |
4 pupils |
3 pupils |
| Number |
4 |
3 |
| Value |
123 |
140 |
| Total value |
492 |
420 |
Total height of the 4 pupils
= 4 x 123
= 492 cm
Total height of the 3 pupils
= 3 x 140
= 420 cm
Height of the fourth pupil
= 492 - 420
= 72 cm
Answer(s): 72 cm
