The average height of a group of 8 boys is 121 cm. When Sam, Japheth and Neave left the group, the average height decreased by 10 cm. What is Sam, Japheth and Neave's total height?
| |
8 boys |
5 boys |
| Number |
8 |
5 |
| Value |
121 |
111 |
| Total value |
968 |
555 |
Total number of boys after 3 boys left the group
= 8 - 3
= 5
New average height after 3 boys left the group
= 121 - 10
= 111 cm
Total height of 8 boys
= 8 x 121
= 968 cm
Total height of 5 boys
= 5 x 111
= 555 cm
Total height of Sam, Japheth and Neave
= 968 - 555
= 413 cm
Answer(s): 413 cm
