Find the number that should replace the question mark (?): \(\displaystyle(?\div12)\times\frac{3}{4}=7.5-2.25\)
Answer & explanation
Correct answer: option 3
The correct answer is Option (3) → 84
Find the right side first, then undo the operations on the left in reverse order: undo \(\times\frac{3}{4}\) by multiplying by \(\frac{4}{3}\), then undo \(\div12\) by multiplying by 12.
Right side \(=7.5-2.25=5.25\)
\(\displaystyle?\div12=5.25\times\frac{4}{3}=7\)
\(?=7\times12=84\)