Hello!
Answer:
Number of birds in the first flock → A=12
Number of birds in the second flock → B=10
Number of birds in the third flock → C=8.
Step-by-step explanation:
The details and instructions are already given. So, let's mark birds in flock by letters A, B, and C.
Given:
Total piece of food for each flock: A=123 | B=99 | C=78 → 123+99+78=300, which gives the total number of pieces of food eaten.
Total number of birds: 30
Solution:
1. Divide each flock's total piece of food by 300: A=123/300=0.41
| B=99/300=0.33
| C=78/300=0.26
If you need the percentage in percents(%), just multiply the numbers by 100: A=0.41*100=41% | B=0.33*100=33% | C=0.26*100=26%
2. Multiply percentage by number of birds(30): A=0.41*30=12.3
| B=0.33*30=9.9
| C=0.26*30=7.8
But(!) birds cannot be counted in decimals; therefore, we have to round up the numbers: A=12 | B=10 | C=8. That is how we obtain number of birds in the flock.