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60% of a number is 10% less than 2 / 5 of 10
Let this number be X
10*2/5-0.6X=9/10
solution
4-0.6X=0.9
0.6X=4-0.9
X=3.1/0.6
X=31/6
This number is 31 / 6
Two fifths of a number is four times less than two fifths of a number
What's the formula
Let the number be X
2/5X+4=2X
X=5/2
Two fifths minus 4.2 is equal to three tenths of a number?
Two fifths minus 4.2 equals three tenths of a number. The number is 42
Let the number be x, then there is an equation
2x/5-4.2=3x/5
The solution is x = 42
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