If you love your mom then you better help me

65 8 7 4 5 6 8 4 3 2 1 9 5 6 4 2 1 6 5 1 5 1 3 2 3 5 multiply the third number in the first row by the seventh number in the third row. add this result to the fifth number in the second row. add to this total ten times the fourth number in the third row. subtract the eighth number in the first row from the result.

If 10 men take 18 days to mow 60 acres of grass, how long will 15 men take to mow 80 acres?

Express -5 2/5 as an improper fraction.