The average height of a group of 4 girls is 119 cm. When Joelle and Winnie joined the group, the average height increased by 7 cm. What is Joelle and Winnie's total height?
| |
4 girls |
6 girls |
| Number |
4 |
6 |
| Value |
119 |
126 |
| Total value |
476 |
756 |
Total number of girls after 2 more girls joined the group
= 4 + 2
= 6
New average height after 2 more girls joined the group
= 119 + 7
= 126 cm
Total height of 4 girls
= 4 x 119
= 476 cm
Total height of 6 girls
= 6 x 126
= 756 cm
Total height of Joelle and Winnie
= 756 - 476
= 280 cm
Answer(s): 280 cm
