The average height of a group of 5 girls is 121 cm. When Hazel and Raeann joined the group, the average height increased by 10 cm. What is Hazel and Raeann's total height?
| |
5 girls |
7 girls |
| Number |
5 |
7 |
| Value |
121 |
131 |
| Total value |
605 |
917 |
Total number of girls after 2 more girls joined the group
= 5 + 2
= 7
New average height after 2 more girls joined the group
= 121 + 10
= 131 cm
Total height of 5 girls
= 5 x 121
= 605 cm
Total height of 7 girls
= 7 x 131
= 917 cm
Total height of Hazel and Raeann
= 917 - 605
= 312 cm
Answer(s): 312 cm
