Yesterday, there were twice as many cows as geese on a farm. Today, 20 cows are sold. There are thrice as many geese now. Find the total number of geese and cows on the farm yesterday.
| |
Cows |
Geese |
Total |
| Before |
2x3 =
6 u |
1x3 =
3 u |
9 u |
| Change |
- 20 |
|
|
| After |
1 u |
3 u |
|
The number of geese at first and in the end remains unchanged. Make the number of geese the same. LCM of 1 and 3 is 3.
Number of cows sold
= 6 u - 1 u
= 5 u
5 u = 20
1 u = 20 ÷ 5 = 4
Total number of geese and cows yesterday
= 6 u + 3 u
= 9 u
= 9 x 4
= 36
Answer(s): 36
