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Two fifths of a number is more than nine tenths of six fifths. What's the number?
Let the number be X
x*2/5-(6/5)*(9/10)=7
2x/5-27/25=7
5*2x-27=7*25
10x=202
x=202/10=101/5
The greatest common factor of 135 and 45 is () and the least common multiple is ()
45 and 135
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