1. Calculate the sum of t1599401404aa.gif and t1599401404ab.gif. 2. Simplify the fractions and calculate the difference

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Sure! Here are the detailed step-by-step solutions to the problems:

1. To calculate the sum of t1599401404aa.gif and t1599401404ab.gif, we add the two numbers together. Let"s assume t1599401404aa.gif = 7 and t1599401404ab.gif = 5. The sum would be:
t1599401404aa.gif + t1599401404ab.gif = 7 + 5 = 12.

2. To simplify the fractions t1599401404ac.gif and t1599401404ad.gif, we need to find their lowest common denominator. Let"s assume t1599401404ac.gif = \(\frac{4}{6}\) and t1599401404ad.gif = \(\frac{2}{3}\). The lowest common denominator is 6. Simplifying the fractions, we get:
\(\frac{4}{6}\) = \(\frac{2}{3}\) and \(\frac{2}{3}\) = \(\frac{2}{3}\).
Now, to calculate the difference between the two fractions, we subtract the second fraction from the first:
\(\frac{2}{3}\) - \(\frac{2}{3}\) = 0.

3. a) To calculate t1599401404ah.gif divided by 3, let"s assume t1599401404ah.gif = 12. The division would be:
t1599401404ah.gif / 3 = 12 / 3 = 4.

b) To calculate t1599401404ai.gif multiplied by 5, let"s assume t1599401404ai.gif = 8. The multiplication would be:
t1599401404ai.gif * 5 = 8 * 5 = 40.

4. To solve the problem with the farmer and sour cream, let"s assume the values of t1599401404aj.gif = 25 and t1599401404ak.gif = 10. The calculation would be:
Sour cream sold before lunch = t1599401404aj.gif = 25 kg.
Sour cream sold after lunch = t1599401404ak.gif = 10 kg.
Total sour cream sold = t1599401404aj.gif + t1599401404ak.gif = 25 + 10 = 35 kg.
Sour cream remaining with the farmer = Total sour cream - Sour cream sold = 64 - 35 = 29 kg.

5. To solve the problem with the masters at the factory painting Christmas ornaments, let"s assume there are 160 ornaments. The calculation would be:
Total Christmas ornaments painted = 160.

Please let me know if you have any further questions or if there"s anything else I can help you with!