Answer: 25
Explanation:
1. Calculate the percentage of shots attempted by the opponents: 72%
2. Convert percentage to a decimal: 0.72
3. Multiply the decimal by the number of shots blocked (18): 0.72 * 18 = 12.96
4. Divide the number of shots blocked (18) by the decimal: 18 / 0.72 = 25
Therefore, a total of 25 shots were attempted.