The average petrol consumption of a vehicle is 1 gallon per 35 km. The cost of 1 litre of petrol is $49. Fund the cost of petrol for a journey of 280 km. (take 1 gallon=4.5 litres)

Step-by-step explanation:

Total petrol consumption of the journey=

Total distance travelled ÷ Average petrol consumption

Given 1 gallon = 4.5 litres,

Total cost of petrol for this particular journey = Petrol consumed x cost of 1 litre of petrol

idk

step-by-step explanation:

step-by-step explanation:

the ratio of red paint to blue paint is always 9/7. that means that, whatever x's value, (4x+12)/(4x-4) has that same ratio. so, set up an equation and cross-multiply to solve for x:

9/7 = (4x+12)/(4x-4)

9(4x-4) = 7(4x+12)

36x - 36 = 28x + 84

8x - 36 = 84

8x = 120

x = 15