You have :
B = ( 5 ) / ( 1/16 ) = ( 5 ) ( 16/1 ) = 80 <------------
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1/8 ÷ 2/5 = 5/16
Division by 1/4 is equivalent to multiplication by its reciprocal, 4. So the answer is 5/16*4 = 5/4
(5/8)/10 = 5/80 = 1/16
5/8//16 is the same as saying, 5/8 * 1/16 = 5/128 ----------------
5 divided by 1 is 5. 1 over 4 is a quarter. 5 divided by 1¼ is 5 divided by 5/4, which is 5 time 4/5, that is 4.