Billy has thrice as many beads as Pierre. Pierre has 10 more beads than Luis. They have a total of 125 beads.
- How many beads does Billy have?
- How many beads does Luis have?
(a)
Number of beads that Pierre has = 1 u
Number of beads that Luis has = 1 u - 10
Number of beads that Billy has = 3 u
Total number of beads
= 1 u + 1 u - 10 + 3 u
= 5 u - 10
5 u - 10 = 125
5 u = 125 + 10
5 u = 135
1 u = 135 ÷ 5 = 27
Number of beads that Billy has
= 3 u
= 3 x 27
= 81
(b)
Number of beads that Luis has
= 1 u - 10
= 27 - 10
= 17
Answer(s): (a) 81; (b) 17
