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Two fifths of a number is 60. What's 20% of the number,
Let this number be X
2/5x=60
x=150
20% of this number is 150 x 20% = 30
One third: two fifths = x: three fourths
1/3：2/5=x：3/4
2x/5=3/4*1/3
x=1/4*5/2
x=5/8
Three quarters of a number is 80 more than two fifths of it
Formula calculation
80÷（3/4-2/5）=1600/7
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