The average height of a group of 7 girls is 116 cm. When Usha and Nora left the group, the average height decreased by 4 cm. What is Usha and Nora's total height?
|
7 girls |
5 girls |
Number |
7 |
5 |
Value |
116 |
112 |
Total value |
812 |
560 |
Total number of girls after 2 girls left the group
= 7 - 2
= 5
New average height after 2 girls left the group
= 116 - 4
= 112 cm
Total height of 7 girls
= 7 x 116
= 812 cm
Total height of 5 girls
= 5 x 112
= 560 cm
Total height of Usha and Nora
= 812 - 560
= 252 cm
Answer(s): 252 cm