Mai earns $7an hour mowing lawns. Her friend Priya earns $8.50 an hour. If Mai started with $15, how many hours will both friends need to work before they have the same amount of money?

30 hours

Step-by-step explanation:

Given that:

Mai = $7 per hour

Priya = $8.50 per hour

Mai's initial amount = $15

Number of hours when they'll both have the same amount

Let number of hours = x

15 + 7x = 8.50x

15 = 8.50x - 7x

15 = 0.5x

x = 30

they'll both have the same amount in 30 hours

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.

probability for j is 1/4

while

a is 1/6