9.9 is the answer. You get it by ignoring the minus signs and then adding the two numbers. So 4.2 + 5.7 equals 9.9.
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Halfway between 42 and 82 is (42 + 82) ÷ 2 = 124 ÷ 2 = 62.
420 is ten times the size of 42. Their difference is 378 .
There are several odd numbers between 42 and 64. One such is 61.
36.2154, for example.