put it into a multiplication/division triangle:
_
/ \
/20\
/___\
/4 | 5\
Cover up the one you want to find.
eg.
20 = 4*5
5 = 20/4
4 = 20/5
| = multiply, _ = divide.
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1/20 divided by 20 = 20/1 times 20 = 40Flip the fraction when dividing
280
(2 x 20 x 50 x 3)/300 = 20
0.0169
The answer is 6 The square root of 9 is 3 times 20 equals 60 divided by 10 equals 6