Eric has five times as many coins as Tom. Tom has 5 more coins than Simon. They have a total of 121 coins.
- How many coins does Eric have?
- How many coins does Simon have?
(a)
Number of coins that Tom has = 1 u
Number of coins that Simon has = 1 u - 5
Number of coins that Eric has = 5 u
Total number of coins
= 1 u + 1 u - 5 + 5 u
= 7 u - 5
7 u - 5 = 121
7 u = 121 + 5
7 u = 126
1 u = 126 ÷ 7 = 18
Number of coins that Eric has
= 5 u
= 5 x 18
= 90
(b)
Number of coins that Simon has
= 1 u - 5
= 18 - 5
= 13
Answer(s): (a) 90; (b) 13
