These: 1 x 40, 2 x 20, 4 x 10, 5 x 8
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There are an infinite number of groups of numbers whose sum, difference, product, quotient etc. is equal to 40 . But there are not four numbers that equal 40. In fact, there is only one number that equals 40. The number is . . . . . 40 .
20
260
143