A clinic administered the covid vaccine to 650 people. 80% of the people were adults. How many of the vaccinated people were children? Think carefully first, then make a decision:
Since 80% of the people were adults, this means 100% - 80% = 20 % were children. 20% of the people vaccinated were children. The number of children is 20% of 650. 20% = 0.2, so 0.2 * 650 = 130 children were vaccinated. So, the answer is 130.