Question

What should be added to the sum of 13/15and 27/20 to get 91/60

Answer 1

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Answer 2

[13/15]+[27/20]+x=[91/60]
x=[91/60]-[27/20]-[13/15]
x=[91/60]-[81/60]-[52/60]
x=[91-81-52]/60
x=-52/60

So, that means you have to add [-52/60] 

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