1 x 20 = 20
2 x 10 = 20
4 x 5 = 20
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There are not 20 ways - there are only 12.
1*20, 2*10, 4*5.
20,110,25,4
You can solve this 2 ways (probably more but I only really know 2). Proportion and Multiplication.(20/100)=(x/35)20*35=700700/100=7OR(.2 is equivalent to 20%).2*35=7.0
Assuming the 20 are all different, there are 20C11 = 20!/(11!*9!) = 167,960 ways.