The average height of a group of 7 girls is 111 cm. When Tammy and Jane joined the group, the average height increased by 5 cm. What is Tammy and Jane's total height?
|
7 girls |
9 girls |
Number |
7 |
9 |
Value |
111 |
116 |
Total value |
777 |
1044 |
Total number of girls after 2 more girls joined the group
= 7 + 2
= 9
New average height after 2 more girls joined the group
= 111 + 5
= 116 cm
Total height of 7 girls
= 7 x 111
= 777 cm
Total height of 9 girls
= 9 x 116
= 1044 cm
Total height of Tammy and Jane
= 1044 - 777
= 267 cm
Answer(s): 267 cm