The average height of seven pupils is 123 cm. If the average height of six pupils is 135 cm, find the height of the seventh pupil.
|
7 pupils |
6 pupils |
Number |
7 |
6 |
Value |
123 |
135 |
Total value |
861 |
810 |
Total height of the 7 pupils
= 7 x 123
= 861 cm
Total height of the 6 pupils
= 6 x 135
= 810 cm
Height of the seventh pupil
= 861 - 810
= 51 cm
Answer(s): 51 cm