The average height of eight pupils is 125 cm. If the average height of seven pupils is 129 cm, find the height of the eighth pupil.
|
8 pupils |
7 pupils |
Number |
8 |
7 |
Value |
125 |
129 |
Total value |
1000 |
903 |
Total height of the 8 pupils
= 8 x 125
= 1000 cm
Total height of the 7 pupils
= 7 x 129
= 903 cm
Height of the eighth pupil
= 1000 - 903
= 97 cm
Answer(s): 97 cm