The average height of a group of 7 boys is 104 cm. When Bobby, Ethan and Howard left the group, the average height decreased by 12 cm. What is Bobby, Ethan and Howard's total height?
| |
7 boys |
4 boys |
| Number |
7 |
4 |
| Value |
104 |
92 |
| Total value |
728 |
368 |
Total number of boys after 3 boys left the group
= 7 - 3
= 4
New average height after 3 boys left the group
= 104 - 12
= 92 cm
Total height of 7 boys
= 7 x 104
= 728 cm
Total height of 4 boys
= 4 x 92
= 368 cm
Total height of Bobby, Ethan and Howard
= 728 - 368
= 360 cm
Answer(s): 360 cm
