The average height of a group of 10 boys is 145 cm. When Albert, Valen and Zeph left the group, the average height decreased by 5 cm. What is Albert, Valen and Zeph's total height?
| |
10 boys |
7 boys |
| Number |
10 |
7 |
| Value |
145 |
140 |
| Total value |
1450 |
980 |
Total number of boys after 3 boys left the group
= 10 - 3
= 7
New average height after 3 boys left the group
= 145 - 5
= 140 cm
Total height of 10 boys
= 10 x 145
= 1450 cm
Total height of 7 boys
= 7 x 140
= 980 cm
Total height of Albert, Valen and Zeph
= 1450 - 980
= 470 cm
Answer(s): 470 cm
