21 over 42, as a fraction, is 1/2. As a division problem, it's .5
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(21/42) / 21 = 1/2
42/20 = 21/10 = 21/10
13/14 + 5/6 = 39/42 + 35/42 = 74/42 = 37/21 or 116/21
rate is 42 over 2 as a fraction 42 on top 2 on the bottom unit rate is 21 over 1 21 on top 1 on bottom
1/2 + 1/3 * 1/7 = 1/2 + 1/21 = 21/42 + 2/42 = 23/42