64,72,80,88,96,104
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To be a multiple of 4, 10 and 20 the number must be a multiple of their lowest common multiple. lcm(4, 10, 20) = 20 What is required is a multiple of 20 between 61 and 107. The numbers 80 and 100 both satisfy the problem of being between 61 and 107 and being a multiple of 4, 10 and 20.
It is: 84
80
72 and 90
84 Because 6 is a multiple of 3, 3 doesn't really count. 6 times 7 is 42. a multiple of 42 that is between 61 and 107 is 84. That is why 84 is the answer.