There are 2100 cups in the package.
Step-by-step explanation:
Given,
Number of green cups in package = 630
This represent 30% of the total package.
Let,
x represent the total number of cups in package.
30% of x = 630

Dividing both sides by 0.30

There are 2100 cups in the package.
Keywords: percentage, division
Learn more about percentages at:
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Https://www.geogebra.org/graphing
Answer:
"((6))" is known number that we can't place any other numbers instead of it
but
"((a))" is unknown number that we can place any other number we want instead of it.
that's the defference between them.
1turn = 360 half a turn is 180
360+180=540