The average height of a group of 10 boys is 115 cm. When Sean, Gabriel and Andy left the group, the average height decreased by 4 cm. What is Sean, Gabriel and Andy's total height?
| |
10 boys |
7 boys |
| Number |
10 |
7 |
| Value |
115 |
111 |
| Total value |
1150 |
777 |
Total number of boys after 3 boys left the group
= 10 - 3
= 7
New average height after 3 boys left the group
= 115 - 4
= 111 cm
Total height of 10 boys
= 10 x 115
= 1150 cm
Total height of 7 boys
= 7 x 111
= 777 cm
Total height of Sean, Gabriel and Andy
= 1150 - 777
= 373 cm
Answer(s): 373 cm
