Find the unknown number using cross multiplication 20/0.64 = 130/X
To find the unknown number using cross multiplication, we can set up the equation as follows:
20/0.64 = 130/X
First, we can cross multiply by multiplying the numerator of the first fraction (20) by the denominator of the second fraction (X).
20 * X = 0.64 * 130
Next, we can simplify the equation by multiplying the numbers on the right side of the equation.
20X = 83.2
To isolate X, we divide both sides of the equation by 20.
X = 83.2/20
Evaluating the division gives us:
X = 4.16
Therefore, the unknown number is 4.16.