a starbucks employee opened a new box of straws. The first day, the employee used 30 straws from the box. The second day, the employee used 15% of the remaining straws in the box. A total of 90 straws were used on the second day. What was the original number of straws in the box before any straws were used?

630 straws were in the box before any was used.

Step-by-step explanation:

So we know that 15% were used out of the remaining straws after 30 was used.

So if 630 straws were there in total then we will substrate 30 from the total 630 and multiply the rest by 15% to find out if it equals 90.

630 - 30=600

600 * 15%=?

600 * 0.15=90

So it makes sense that 630 straws were there in total.

312312

step-by-step explanation:

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.