42% of what number is 0.21?
0.42x=0.21
x=0.21/0.42
x=21/42
ANSWER:
x=1/2
x=0.5
0.42x = 0.21
Solve
To find out 42% of a number, you would multiply that number by 0.42. In this case, you want to determine what number, when multiplied by 42%, equals 0.21.
Let's call the number you're looking for 'x'.
The equation can be written as:
0.42 * x = 0.21
To solve for 'x', divide both sides of the equation by 0.42:
x = 0.21 / 0.42
Now, divide 0.21 by 0.42 to find the value of 'x':
x = 0.5
Therefore, 42% of 0.5 is equal to 0.21.