Billy had 315 buttons less than Esther. Given that they have a total of 629 buttons,
- How many buttons did Esther have?
- How many buttons did Billy have?
(a)
Number of buttons that Esther had = 1 u
Number of buttons that Billy had = 1 u - 315
Total number of buttons
= 1 u + 1 u - 315
= 2 u - 315
2 u - 315 = 629
2 u = 629 + 315
2 u = 944
1 u = 944 ÷ 2 = 472
Number of buttons that Esther had
= 1 u
= 472
(b)
Number of buttons that Billy had
= 1 u - 315
= 472 - 315
= 157
Answer(s): (a) 472; (b) 157
