Billy, Sam and Carl went shopping. Billy and Sam spent a total of $235. Billy and Carl spent $685 altogether. Carl spent 7 times as much as Sam.
- How much did Sam spend?
- How much did Billy spend?
(a)
Amount that Billy spent = B
Amount that Sam spent = S
Amount that Carl spent = C
B + C = 685
B + S = 235
S = 1 u
C = 7 x 1 u = 7 u
Amount that Carl spent more than Sam
= 7 u - 1 u
= 6 u
6 u = 685 - 235
6 u = 450
1 u = 450 ÷ 6 = 75
Amount that Sam spent
= 1 u
= $75
(b)
Amount that Billy spent
= 235 - 75
= $160
Answer(s): (a) $75; (b) $160