One canteen bought 160 kg of chicken and beef.
13 of the chicken and
35 of the beef were sold. The amount of beef sold was 12 kg more than the amount of chicken sold.
- How much beef did the canteen buy?
- How much chicken did the canteen buy?
|
Chicken |
Beef |
Total |
Before |
3x3 = 9 u |
5 u |
+ 20 |
160 |
Change |
- 1x3 = - 3 u |
- 3 u |
- 12 |
|
After |
2x3 = 6 u |
2 u |
+ 8 |
|
(a)
12 ÷ 3 x 5 = 20
12 ÷ 3 x 2 = 8
Total mass of chicken and beef bought
= 9 u + 5 u + 20
= 14 u + 20
14 u + 20 = 160
14 u = 160 - 20
14 u = 140
1 u = 140 ÷ 14 = 10
Mass of beef bought
= 5 u + 20
= 5 x 10 + 20
= 50 + 20
= 70 kg
(b)
Mass of chicken bought
= 9 u
= 9 x 10
= 90 kg
Answer(s): (a) 70 kg; (b) 90 kg