In A survey of 3005 adults ages 57 through 85 years it was found that 81.7% of them used at least one prescription medication. How many of the 3005 subjects used at least one prescription medication

Multiply 3005 by 0.817 to get your answer. Doing this gives you 81.7% of the total people surveyed which happens to be the amount of people who 'use at least one prescription medication' as outlined by the problem.

So you have to figure out 81.7% of 3005.

3005 : 2 = 1502.5 = 50%

3005 : 5 = 601 = 20%

3005 : 10 = 300.5 = 10%

3005 : 100 = 30.05 = 1%

3005 : 1000 = 3.005 = 0.1%

Then you just add

1502.5 + (601 + 300.5) + 30.05 + (3.005 x 7)

1502.5 + 901.5 + 30.05 + 21.035

= 2455.085 (the answer)

The answer above is if you have a calculator/if it's a calculator question