The average height of seven pupils is 126 cm. If the average height of six pupils is 140 cm, find the height of the seventh pupil.
|
7 pupils |
6 pupils |
Number |
7 |
6 |
Value |
126 |
140 |
Total value |
882 |
840 |
Total height of the 7 pupils
= 7 x 126
= 882 cm
Total height of the 6 pupils
= 6 x 140
= 840 cm
Height of the seventh pupil
= 882 - 840
= 42 cm
Answer(s): 42 cm