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jek_recluse [69]
3 years ago
8

Solve for x : 7/8 = 21/x

Mathematics
2 answers:
castortr0y [4]3 years ago
8 0
Hey!

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

Our final answer would be,
x=24

Thanks!
-TetraFish
Ira Lisetskai [31]3 years ago
3 0
\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 Choice. 2
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