part 3
150 - 74 = 76
74 * 1 + 76 * (-1) = 74 - 76 = -2 dollars
odd even total #
22 28 50
24 26 50
74 76 150
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sub-
total 120 140 250
You lost 20 dollars.
part 4
To break even means that the answer is equal to 0, or you have an equal
number of odd and even rolls.
odd even total #
22 28 50
24 26 50
74 76 150
30 20 50
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sub-
total 150 150 300
therefore to break even and toatl 150 in both of the odd and even columns, you need 30 odd rolls, and 20 even rolls.