The average height of a group of 5 girls is 127 cm. When Julie and Sarah joined the group, the average height increased by 11 cm. What is Julie and Sarah's total height?
|
5 girls |
7 girls |
Number |
5 |
7 |
Value |
127 |
138 |
Total value |
635 |
966 |
Total number of girls after 2 more girls joined the group
= 5 + 2
= 7
New average height after 2 more girls joined the group
= 127 + 11
= 138 cm
Total height of 5 girls
= 5 x 127
= 635 cm
Total height of 7 girls
= 7 x 138
= 966 cm
Total height of Julie and Sarah
= 966 - 635
= 331 cm
Answer(s): 331 cm