Billy bought 5 times as many white chocolate bars as dark chocolate bars. The total mass of white chocolate bars and dark chocolate bars was 1410 g. The mass of dark chocolate bars was 290 g less than that of the white chocolate bars. The mass of 1 dark chocolate bar was 78 g heavier than 1 white chocolate bar.
- Find the number of dark chocolate bars that Billy bought.
- Find the mass of 1 white chocolate bar.
|
White Chocolate Bars |
Dark Chocolate Bars |
Total |
Number of sets |
5 sets |
1 set |
|
Compare each |
1 u |
1 u + 78 |
|
Total value |
850 g |
560 g |
1410 g |
(a)
Mass of dark chocolate bars = 1 set
Mass of white chocolate bars = 5 sets
Mass of dark chocolate bars = (1410 - 290) ÷ 2 = 560 g
Mass of white chocolate bars = 560 + 290 = 850 g
Mass of 1 set of dark chocolate bars = 560 g
Mass of 1 set of white chocolate bars = 850 ÷ 5 = 170 g
Difference in the mass between 1 set of dark chocolate bars and 1 set of white chocolate bars
= 560 - 170
= 390 g
Number of items in each set
= 390 ÷ 78
= 5
Number of dark chocolate bars
= 1 x 5
= 5
(b)
Mass of 1 dark chocolate bar
= 560 ÷ 5
= 112 g
Mass of 1 white chocolate bar
= 112 - 78
= 34 g
Answer(s): (a) 5; (b) 34 g