Each crayon weighs 9 grams. First, if the box is 15 grams, you need subtract 105 with 15, which is 90. Then, divide 90 by 10(the amount of crayons), and you get 9, so each crayon weighs 9 grams
Simple...
you have

and

Just subtract...but first find a common denominator...
Use 40 as the common denominator...

and

So, subtract,

=

Thus, your answer.
Answer:
68
Step-by-step explanation:
70+2-4= 68
[(upper legth + lower length) x height] divided by 2