The average height of a group of 9 girls is 146 cm. When Eva and Shiyun left the group, the average height decreased by 3 cm. What is Eva and Shiyun's total height?
| |
9 girls |
7 girls |
| Number |
9 |
7 |
| Value |
146 |
143 |
| Total value |
1314 |
1001 |
Total number of girls after 2 girls left the group
= 9 - 2
= 7
New average height after 2 girls left the group
= 146 - 3
= 143 cm
Total height of 9 girls
= 9 x 146
= 1314 cm
Total height of 7 girls
= 7 x 143
= 1001 cm
Total height of Eva and Shiyun
= 1314 - 1001
= 313 cm
Answer(s): 313 cm
