One eating house bought 126 kg of pork and chicken.
12 of the pork and
47 of the chicken were sold. The amount of chicken sold was 12 kg more than the amount of pork sold.
- How much chicken did the eating house buy?
- How much pork did the eating house buy?
|
Pork |
Chicken |
Total |
Before |
2x4 = 8 u |
7 u |
+ 21 |
126 |
Change |
- 1x4 = - 4 u |
- 4 u |
- 12 |
|
After |
1x4 = 4 u |
3 u |
+ 9 |
|
(a)
12 ÷ 4 x 7 = 21
12 ÷ 4 x 3 = 9
Total mass of pork and chicken bought
= 8 u + 7 u + 21
= 15 u + 21
15 u + 21 = 126
15 u = 126 - 21
15 u = 105
1 u = 105 ÷ 15 = 7
Mass of chicken bought
= 7 u + 21
= 7 x 7 + 21
= 49 + 21
= 70 kg
(b)
Mass of pork bought
= 8 u
= 8 x 7
= 56 kg
Answer(s): (a) 70 kg; (b) 56 kg