The average height of a group of 7 boys is 121 cm. When Julian, John and Harry left the group, the average height decreased by 8 cm. What is Julian, John and Harry's total height?
| |
7 boys |
4 boys |
| Number |
7 |
4 |
| Value |
121 |
113 |
| Total value |
847 |
452 |
Total number of boys after 3 boys left the group
= 7 - 3
= 4
New average height after 3 boys left the group
= 121 - 8
= 113 cm
Total height of 7 boys
= 7 x 121
= 847 cm
Total height of 4 boys
= 4 x 113
= 452 cm
Total height of Julian, John and Harry
= 847 - 452
= 395 cm
Answer(s): 395 cm
