The average height of a group of 7 girls is 125 cm. When Barbara and Elyse joined the group, the average height increased by 2 cm. What is Barbara and Elyse's total height?
|
7 girls |
9 girls |
Number |
7 |
9 |
Value |
125 |
127 |
Total value |
875 |
1143 |
Total number of girls after 2 more girls joined the group
= 7 + 2
= 9
New average height after 2 more girls joined the group
= 125 + 2
= 127 cm
Total height of 7 girls
= 7 x 125
= 875 cm
Total height of 9 girls
= 9 x 127
= 1143 cm
Total height of Barbara and Elyse
= 1143 - 875
= 268 cm
Answer(s): 268 cm