The average height of a group of 4 boys is 145 cm. When John, Michael and Warren joined the group, the average height increased by 12 cm. What is John, Michael and Warren's total height?
| |
4 boys |
7 boys |
| Number |
4 |
7 |
| Value |
145 |
157 |
| Total value |
580 |
1099 |
Total number of boys after 3 more boys joined the group
= 4 + 3
= 7
New average height after 3 more boys joined the group
= 145 + 12
= 157 cm
Total height of 4 boys
= 4 x 145
= 580 cm
Total height of 7 boys
= 7 x 157
= 1099 cm
Total height of John, Michael and Warren
= 1099 - 580
= 519 cm
Answer(s): 519 cm
