Question

Average weight of a group of 6 girls is 26. If we
replace a girl of weight 30 in the group with
another girl so that new average increases by 5.
Find the weight of new girl.
1. 30
2. 40
3. 50
4. 60​

Answer 1

Step-by-step explanation:

Average weight= 26

x/6= 26

x= 156

Let y be the age of the new girl

we have (156-30+y) after replacing

Thus, average = (126+y)/6= 26+ 5 ( 5 increase in average)

126+y= 6×31

y= 186-126

= 60

the weight of new girl is 60.