Question

For his science experiment, Julio placed a pan of water in his refrigerator to see how long it would take to evaporate. After 2 days, there were 280 ml of water in the pan, and after 4 days, there were 240 ml of water in the pan. In his report, he noted that the same amount of water evaporated each day. How many milliliters of water were in the pan to start?

Answer 1

Julio's experiment showed that water evaporates at a rate of 20 milliliters each day in his refrigerator. Thus, the initial amount of water in the pan was 320 milliliters.

Step-by-step explanation:

First, we need to calculate how much water evaporated each day. So, in 2 days, 280 milliliters of water remained, and in 4 days, 240 milliliters were left. That means 40 milliliters evaporated in 2 days. Divide 40 by 2, and we see that 20 milliliters of water evaporated each day.

To know how much water was originally in the pan, we subtract the amount evaporated from the amount left after each period. So, for the first 2 days, that's 280 milliliters + (2 * 20 milliliters), which is 320 milliliters. So, Julio initially had 320 milliliters of water in his pan for the experiment.

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