David and Perry have 5 beads altogether. David has 7 more beads than Perry. Find the number of beads each boy has.
- Perry
- David
Number of beads that Perry has = 1 u
Number of beads that David has = 1 u + 7
Total number of beads
= 1 u + 1 u + 7
= 2 u + 7
2 u + 7 = 5
2 u = 5 - 7 = -2
1 u = -2 ÷ 2 = -1
(a)
Number of beads that Perry has
= 1 u
= -1
(b)
Number of beads that David has
= 1 u + 7
= -1 + 7
= 6
Answer(s): (a) -1; (b) 6
