Mark and Ethan have 5 marbles altogether. Mark has 9 more marbles than Ethan. Find the number of marbles each boy has.
- Ethan
- Mark
Number of marbles that Ethan has = 1 u
Number of marbles that Mark has = 1 u + 9
Total number of marbles
= 1 u + 1 u + 9
= 2 u + 9
2 u + 9 = 5
2 u = 5 - 9 = -4
1 u = -4 ÷ 2 = -2
(a)
Number of marbles that Ethan has
= 1 u
= -2
(b)
Number of marbles that Mark has
= 1 u + 9
= -2 + 9
= 7
Answer(s): (a) -2; (b) 7
