Respuesta :

Amphitrite1040
[tex] \frac{21}{1} \frac{7}{8} = \frac{21}{x} ( \frac{21}{1} ) \\ Cross-out, the DOUBLE 21's \\ 7(x) = 21 \\ 21(8) = ? \\ 7(x) = 168 \\ \frac{168}{7} = 24 \\ Answer: x = 24 [/tex] [tex]Choice. 2 [/tex]
Hey!

We could write the problem like this,
[tex]\frac{7}{8}=\frac{21}{x}[/tex]
Cross multiply!
[tex]7x=8\cdot \:21[/tex]
We know that [tex]8\cdot \:21=168[/tex], let's plug that in.
[tex]7x=168[/tex]
Divide both sides by 7.
[tex]\frac{7x}{7}=\frac{168}{7}[/tex]

Our final answer would be,
[tex]x=24[/tex]

Thanks!
-TetraFish

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