Question

Mark and Don are planning to sell each of their marble collections at a garage sale. If Don has 7 mo

than 3 times the number of marbles Mark has, how many does each boy have to sell if the total numbe
of marbles is 103?
Mark has Number
marbles to sell.
Don has Number
marbles to sell.​

Answer 1

Mark has 24

Don has 79

Explanation:

Let x = marbles mark has

don has 3x+7

Together they have 103

mark + don = 103

x+ (3x+7) = 103

Combine like terms

4x+7 = 103

Subtract 7

4x = 96

Divide by 4

x = 96/4

x =24

Mark has 24

Don has 103 -24

Done has 79