what fraction of 4/7 must be added to itself to make the sum 1+1/4
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let the unknown number to be added be x
therefore,
x + 4/7 = 1+1/4
x = 6/4-4/7
= (21-8)/14
= 13/14
let the unknown number to be added be x
therefore,
x + 4/7 = 1+1/4
x = 6/4-4/7
= (21-8)/14
= 13/14
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