The average height of eight pupils is 120 cm. If the average height of seven pupils is 117 cm, find the height of the eighth pupil.
|
8 pupils |
7 pupils |
Number |
8 |
7 |
Value |
120 |
117 |
Total value |
960 |
819 |
Total height of the 8 pupils
= 8 x 120
= 960 cm
Total height of the 7 pupils
= 7 x 117
= 819 cm
Height of the eighth pupil
= 960 - 819
= 141 cm
Answer(s): 141 cm