+118654 What is 81\(blank/4)=9? I can't figure out blank!
I assume that you mean
81/(blank/4)=9?
\(81 \div \frac{x}{4}=9\\ 81 \div \frac{x}{4}\times \frac{x}{4}=9\times \frac{x}{4}\\ 81= \frac{x}{4}\times 9\\ 81= \frac{9x}{4}\\ 81\times \frac{4}{9}= \frac{9x}{4}\times \frac{4}{9}\\ 9\times4= x\\ x=36 \)
OR
I could have just said
81/9=9
so
blank/4=9
so
36/4 = 9 so the number must be 36
