3 9/10

3 9/10 is the same as the sum of 3 1/3 and half of a number.

Correct answer:

x =  1 215 = 17/15

Step-by-step explanation:

a=3109=3+109=103 10+9=1039=3.9 b=331=3+31=33 3+1=3103.3333  a=b+x/2 3.9=3.3333333333333+x/2  x=1.133333  x=15171.133333=1517=1152=1.1333

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