Question

Solve pls thank you​

Answer 1

B.

Explanation:

So there are 16 grams initally. Then, the amount of water decreases by 3.5%.

So first we must find 3.5% of 16. 3.5% in decimal form is 0.035, since you divide 3.5 by 100. Then, when you multiply 0.035 by 16, you get 0.56. Since the solution decreased by that percentage, you must subtract 0.56 from 16, which is 15.44.

Then the amount of water decreases by 4.25%. That in decimal form is 0.0425. You multiply it by 15.44, and it comes out to 0.6562. You subtract that from 15.44, not 16, since some of the water has evaporated. So you get 14.7838.

Answer 2

B

Explanation:

We start with 16 grams of water

At the end of the first hour , we decreased by 3.5%

We take the amount and multiply by the percent decreased. Then subtract that from the original amount

16*3.5% =

16*.035 =.56

16-.56 = 15.44

At the end of the second hour , we decreased by 4.25%

We take the amount and multiply by the percent decreased. Then subtract that from the amount we started with at hour 2

15.44 *4.25%

15.44 *.0425=.6562

15.44-.6562=14.788