6/20 + 15/20 = 21/20 = 1 and 1/20
or
0.3 + 0.75 = 1.05
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It would have been much qiucker to use your calculator. I can tell you that the answer is 310 but how do you know that I have not made a mistake?
the answer to 12 plus 34 eguals 46
712
79.
n=22 22 +12 34