6 numbers can go into 20; they are 1, 2, 4, 5, 10 and 20.
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1,19,23,27,30 ( divided by ) 5= 20
The answer is 20C4 = 20*19*18*17/(4*3*2*1) = 4845
You can just find the factors: 1x30 2x15 3x10 5x6 so that's 8 numbers
There are many answers. Here is one: 58 and 20
There are 8 out of 20 numbers that are prime, so 8/20, or 2/5.