5 x 8 = 40.
"Solution set" is probably NOT the word to use here, as it refers to an algebra problem.
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40, if it's exactly 5x8 and there's no cutting involved. So get at least 48.
Yes, empty set means null which is no solution.
An empty set is a set with no elements. It can be symbolized by {} or ø. The solution set for an equation that has no solution is also called an empty set.
2/5 - 3/8 = (2x8)/(5x8) - (5x3)/(5x8) = 16/40 - 15/40 = 1/40
A set would not normally have a solution. An equation or an inequality might.