A pool is draining at a constant rate. Five minutes ago, the pool had 180 gallons of water in the pool. Now there is 120 gallons of water remaining in the pool. If the pool can hold 270 gallons of water, how many minutes ago was the pool Full

12 and a half minutes ago

Step-by-step explanation:

In five minutes, the pool drained 180-120=60 gallons of water. This means that the pool loses 60/5=12 gallons of water per minute.

You can make the equation 270-12x=120, where x is the amount of minutes passed.

Subtract 270 on both sides to get -12x=-150

Divide both sides by -12

x=150/12 which is 12.5

Therefore, x=12.5 or 12 and a half minutes ago

if gloria has "carry over" minutes, (that is, any minutes paid for but not used in a month can be applied to her payment for minutes in the next month,) her total usage for the three months is: total minutes = 320 + 243 + 489 = 1052 minutes number of 200 minute blocks = 1052/200 = 5 r52 (that is 5 with a remainder of 52) rounding up the number of 200 minute blocks gives her usage for the three months as 6 blocks. the cost for six blocks is 6 x $25 = $150 she also has 200 - 52 or 148 carry over minutes if gloria pays each month and unused minutes are lost, applying the rounding up procedure to each month gives: first month usage of 320 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 second month usage of 243 minutes rounds up to 2 blocks of 200 minutes for a payment of 2 x $25 = $50 third month usage of 489 minutes rounds up to 3 blocks of 200 minutes for a payment of 3 x $25 = $75 total payments for the three months are $50 + $50 + $75 = $175 get the plan with carry over minutes!