One eating house bought 190 kg of chicken and beef.
15 of the chicken and
25 of the beef were sold. The amount of beef sold was 10 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 |
5x2 = 10 u |
5 u |
+ 25 |
190 |
Change |
- 1x2 = - 2 u |
- 2 u |
- 10 |
|
After |
4x2 = 8 u |
3 u |
+ 15 |
|
(a)
10 ÷ 2 x 5 = 25
10 ÷ 2 x 3 = 15
Total mass of chicken and beef bought
= 10 u + 5 u + 25
= 15 u + 25
15 u + 25 = 190
15 u = 190 - 25
15 u = 165
1 u = 165 ÷ 15 = 11
Mass of beef bought
= 5 u + 25
= 5 x 11 + 25
= 55 + 25
= 80 kg
(b)
Mass of chicken bought
= 10 u
= 10 x 11
= 110 kg
Answer(s): (a) 80 kg; (b) 110 kg