Let the unknown be x
1) 4.65 + x =7.88
x = 7.88 - 4.65 = 3.23
The option is yes
2) x + 6.42 = 9.45
x = 9.45 - 6.42 = 3.03
The option is No
3)2.85 + x = 6.08
x = 6.08 -2.85 = 3.23
The option is Yes
4) x + 8.49 = 10.72
x = 10.72 - 8.49 =
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