The cost of 3 cheese sandwiches and 2 bottles of water is £7.80. The cost of 5 cheese sandwiches and 4 bottles of water is £14.20. What is the cost of: (a) one cheese sandwich? (b) one bottle of water?

sandwiches is £1.8

bottle water = £1.2

Step-by-step explanation:

Given data

let cheese sandwiches be x

and bottle water be y

3x+2y= 7.81

5x+4y= 14.202

solve 1 and 2

3x+2y= 7.81*5

5x+4y= 14.202*3

 15x+10y= 39

- 15x+12y= 42.6

        -2y = -3.6

y= 3.6/2

x=1.8

Put x= 1.8 in 1

3(1.8)+2y= 7.8

5.4+2y= 7.8

2y= 7.8-5.4

2y=2.4

y= 2.4/2

y= 1/2

Hence cheese sandwiches is £1.8

bottle water = £1.2

answer: c

step-by-step explanation: because you don't have to draw a point of intersection. couldyou give me brainliest?

u

use an equation of ratios to determine the amount of gas needed to fill the tank.

    0.2             0.8

  =    

288.75             x

                                                              231 gal

so, 0.2x = (0.8)(288.75 gal), and x = = 1155 gal.

                                                                0.2

it would take 1155 gal. to fill the tank.

the cost would be

1155 gal         $3

* = $3465   (answer)

      1           1 gal

hope this you