It would be easier to change these to decimals and then add.
But -- to add them as fractions, you need to find the common denominator, which is 270. (I found that by adding 27 + 27 + 27, etc., until I found a number also divisible by 18 and 10.)
7/27 = 70/270
1/18 = 15/270
1/10 = 27/270
Add the numerators.
Add
7/27 + 1/18 + 1/10
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