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2/7 * 21/50 = 3/25
42
2/7=0.28571428571
1,656
0.2857
2/7 of 623 is 178
1 x 21, 3 x 7
10.5 x 2=21
2 when multiplied by 21 = 42
37/7
10 is two sevenths of 35.
2/21
35/12