One eating house bought 220 kg of chicken and beef.
12 of the chicken and
58 of the beef were sold. The amount of beef sold was 25 kg more than the amount of chicken sold.
- How much beef did the eating house buy?
- How much chicken did the eating house buy?
|
Chicken |
Beef |
Total |
Before |
2x5 = 10 u |
8 u |
+ 40 |
220 |
Change |
- 1x5 = - 5 u |
- 5 u |
- 25 |
|
After |
1x5 = 5 u |
3 u |
+ 15 |
|
(a)
25 ÷ 5 x 8 = 40
25 ÷ 5 x 3 = 15
Total mass of chicken and beef bought
= 10 u + 8 u + 40
= 18 u + 40
18 u + 40 = 220
18 u = 220 - 40
18 u = 180
1 u = 180 ÷ 18 = 10
Mass of beef bought
= 8 u + 40
= 8 x 10 + 40
= 80 + 40
= 120 kg
(b)
Mass of chicken bought
= 10 u
= 10 x 10
= 100 kg
Answer(s): (a) 120 kg; (b) 100 kg