Riordan had 231 buttons more than Dana. Given that they have a total of 439 buttons,
- how many buttons did Dana have?
- how many buttons did Riordan have?
(a)
Number of buttons that Riordan that = 1 u + 231
Number of buttons that Dana had = 1 u
Total number of buttons
= 1 u + 231 + 1 u
= 2 u + 231
2 u + 231 = 439
2 u = 439 - 231
2 u = 208
1 u = 208 ÷ 2 = 104
Number of buttons that Dana had
= 1 u
= 104
(b)
Number of buttons that Riordan had
= 1 u + 231
= 104 + 231
= 335
Answer(s): (a) 104; (b) 335
