90=20r*10

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Solution for 90=20r*10 equation:


Simplifying
90 = 20r * 10

Reorder the terms for easier multiplication:
90 = 20 * 10r

Multiply 20 * 10
90 = 200r

Solving
90 = 200r

Solving for variable 'r'.

Move all terms containing r to the left, all other terms to the right.

Add '-200r' to each side of the equation.
90 + -200r = 200r + -200r

Combine like terms: 200r + -200r = 0
90 + -200r = 0

Add '-90' to each side of the equation.
90 + -90 + -200r = 0 + -90

Combine like terms: 90 + -90 = 0
0 + -200r = 0 + -90
-200r = 0 + -90

Combine like terms: 0 + -90 = -90
-200r = -90

Divide each side by '-200'.
r = 0.45

Simplifying
r = 0.45

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