There are 30 apples in a box. The mean weight of these 30 apples Is 120 grams. There are 10 apples in a bag. The mean weight of these 10 apples Is 95 grams. Work out the mean weight of the 40 apples.

Question

There are 30 apples in a box.

The mean weight of these 30 apples Is 120 grams.

There are 10 apples in a bag.

The mean weight of these 10 apples Is 95 grams.

Work out the mean weight of the 40 apples.

Answer 1

30 x 120 = 3600

10 x 95 = 950

3600+950 = 4550

4550/40 = 455/4 = 113.75 grams = mean weight of the 40 apples

= about 114

mean of all 40 apples = 113.75

120-114 = 6

114-95 = 19

19/6 = about 3

30/10 = 3

3 times as many apples with mean 120 as apples with mean 95.