Ariel weighed an object on her balance and recorded a mass of 23.9 grams. Her teacher told her that there was obviously something wrong with her balance because it was giving her a reading which was 30.4% too high. What was the actual mass of the object?

Rounded: 16.34

Step-by-step explanation:

The OG(original) mass is 23.9 grams.

30.4% is too high of the actual mass.

Find out 69.6% of 23.9.

Set up problem.

    x            69.6%                  

=

 23.9          100%

Find x.

69.6 x 23.9 = 1,663.44

1,663.44/100 = 16.344

= 16.344

Not sure if this is correct but I tried my best. :)

step-by-step explanation:

12: 00 p.m. to 7: 00 p.m. is a total of 7 hours.

4: 00 p.m. to 7: 00 p.m. is a total of 3 hours.

this means that from 4: 00 p.m to 7: 00 p.m. this represents 3/7 of what was lost from 12: 00 p.m. to 7: 00 p.m.

after knowing this, after doing 11,600 - 6,800 = 4,800

4,800 represents 3/7 of what was lost for 7 hours.

we then divide 4,800 by 3 which gets 1,600.

because we know that 1,600 represents 1/7 of how much water was lost, we just have to multiply by 7, which gets 11,200.   after adding 11,200 to how much water was left at 7: 00 p.m. which was 6,800. 11,200 + 6,800 = 18,000

this means that the pool originally had 18,000 gallons in the pool.

you can also check your work by doing 18,000 - 4(1600), which becomes           1800 - 6400 which gets you 11,600.