how do I solve this problem

Question

A carton of oranges

weighs 34

lb 2

oz, but 2

lb 8

oz of this weight is due to packaging. Subtract the weight of the packaging to find the actual weight of the oranges

in 4

cartons.

Answer 1

We'll use the fact that 1 lb = 16 oz of weight.

 

One carton of oranges (including the packaging/carton weight) is 34 lb 2 oz

and the packaging/carton weight alone is to be subtracted:           2 lb 8 oz

 

We will have to borrow one lb from the top number and convert it to 16 oz, so now our problem is

33 lb 18 oz

-2 lb   8 oz

______________

31 lb 10 oz is the net weight, oranges only, for one carton's contents.

 

If we multiply this by 4 we get  124 lb 40 oz and we should change the 40 oz to 2 lb 8 oz and thus we have

124 lb plus 2 lb 8 oz for a net (oranges) weight of 126 lb 8 oz.