The average height of a group of 10 boys is 137 cm. When Gabriel, Julian and Warren left the group, the average height decreased by 2 cm. What is Gabriel, Julian and Warren's total height?
| |
10 boys |
7 boys |
| Number |
10 |
7 |
| Value |
137 |
135 |
| Total value |
1370 |
945 |
Total number of boys after 3 boys left the group
= 10 - 3
= 7
New average height after 3 boys left the group
= 137 - 2
= 135 cm
Total height of 10 boys
= 10 x 137
= 1370 cm
Total height of 7 boys
= 7 x 135
= 945 cm
Total height of Gabriel, Julian and Warren
= 1370 - 945
= 425 cm
Answer(s): 425 cm
