Adding mixed 3

Why does 1 3/4 + 2 9/10 equal 4.65?
How do you solve this?

Correct answer:

x =  4.65

Step-by-step explanation:

a=1+34=74=134=1.75 b=2+910=2910=2910=2.9  x=a+b=1.75+2.9=9320=41320=4.65

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