Answer:
8 1/2 liters
Explanation:
In the morning the cow produced 2 3/5 liters of milk.
In the evening, the cow produced 3 3/10 more than in the morning; this means to find the total amount produced in the evening we add
2 3/5 + 3 3/10
To add these, find a common denominator; the first thing 5 and 10 will both go into is 10. It takes two 5's to make 10; this means we use two 3's on the numerator, which gives us 2 6/10.
The second fraction is already over 10, so we do not need to change it.
2 6/10 + 3 3/10
Add the whole numbers, then add the numerators; this gives us 5 9/10. The cow produces 5 9/10 liters in the evening.
To find the total amount produced that day, add this number to the amount in the morning:
5 9/10 + 2 3/5
The common denominator is 10 again. Changing 2 3/5 to tenths is still 2 6/10:
5 9/10 + 2 6/10 = 7 15/10
15/10 is improper. 10 will go into 15 one time; this is the whole number. We add this to 7, giving us 8. This leaves us with 15-10=5 for the numerator:
8 5/10
This simplifies to 8 1/2.