Justin had
19 as many coins as Charlie. Charlie had thrice as many coins as Tommy. If Justin had 100 coins fewer than Tommy,
- how many coins did Justin have?
- how many coins did they have altogether?
(a)
Number of coins that Justin had = 1 u
Number of coins that Charlie had = 9 u
Number of coins that Tommy had = 9 u ÷ 3 = 3 u
Number of coins that Justin had fewer than Tommy
= 3 u - 1 u
= 2 u
2 u = 100
1 u = 100 ÷ 2 = 50
Number of coins that Justin had
= 1 u
= 50
(b)
Total number of coins that they had
= 1 u + 9 u + 3 u
= 13 u
= 13 x 50
= 650
Answer(s): (a) 50; (b) 650
