The sum 38

The sum of two decimal numbers is four. Their difference is one. What are the numbers?

Correct answer:

a =  2.5
b =  1.5

Step-by-step explanation:

a+b=4 ab=1  a+b=4 ab=1  Row2Row1Row2 a+b=4 2b=3  b=23=1.5 a=4b=41.5=2.5  a=25=2.5 b=23=1.5

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