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Sagot :
Answer:
3 times.
Step-by-step explanation:
We begin by knowing that 4/7 is greater than 4/21. So you should know how many times there are more blue marbles than red marbles. That's,
Let X = number of times there are more blue marbles than red marbles
4/7 = X * 4/21
Isolating X,
X = 4/7 ÷ 4/21
That's,
[tex]\frac{4}{7} / \frac{4}{21}=\frac{4*21}{4*7}=\frac{84}{28}= 3[/tex]
Then there are three times more blue marbles than red marbles.
It can be easily demonstrated, by substituting X in the original equation, or multiplying 3 by 4/21
4/7 = X * 4/21
4/7 = 3 * 4/21
4/7 = 12/21
4/7 = 12/3 / 21/3
4/7 = 4/7
Hope this helps!
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