Avehicle can hold 30 gallons of gasoline. consume 4.5 per 100 km, if you leave with a full tank and travel 250 km, how many gallons are needed to refill the tank?

The answer to your question is 11.25 gal

Step-by-step explanation:

Data

Capacity = 30 gal of gasoline

Consumption = 4.5 gal per 100 km

Process

1.- Calculate the gasoline used in 250 km

                    4.5 gal      100 km

                      x               250 km

                      x = (250 x 4.5) / 100

                      x = 1125 / 100

                      x = 11.25 gallons

2.- Calculate the gasoline that remain in the tank

       Gasoline in the tank = Full tank - Gasoline used

                                          = 30 gal - 11.25 gal

                                          = 18.75 gal

3.- Calculate the gallons needed to refill the tank.

     The gasoline needed to refill the tank is that same that the gasoline used during the first 250 km traveled.

3

step-by-step explanation:

in standard form:

a= dictionaries

b= maps

you have to buy 3 dictionaries, so put a 3 next to the a (dictionaries) so that you can multiply them by each other.

a3+b= 60 (the amount of money you have)

we already know the cost of a=15 so replace a with $15

($15 x 3)+b=60

multiply 15 and 3 to get $45 and replace it with $45

45+b=60

and then replace b with 15 to get the total:

45+15=60

that means you have $15 left after buying 3 dictionaries.

15 divided by the cost of a map ($5) equals 3.

so you can buy 3 maps.

sorry if it was confusing!

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!