The average height of a group of 10 boys is 112 cm. When Simon, Howard and Brandon left the group, the average height decreased by 8 cm. What is Simon, Howard and Brandon's total height?
| |
10 boys |
7 boys |
| Number |
10 |
7 |
| Value |
112 |
104 |
| Total value |
1120 |
728 |
Total number of boys after 3 boys left the group
= 10 - 3
= 7
New average height after 3 boys left the group
= 112 - 8
= 104 cm
Total height of 10 boys
= 10 x 112
= 1120 cm
Total height of 7 boys
= 7 x 104
= 728 cm
Total height of Simon, Howard and Brandon
= 1120 - 728
= 392 cm
Answer(s): 392 cm
