A car consumes a gallon of petrol for every 30km drive. The driver of the car set out on a journey of 420km with 10 gallons of petrol in the fuel tank. (I) How many more gallons of petrol we be needed to complete the journey. (ii) Find the cost of petrol used for the journey of 420km if a gallon of petrol cost Ghc 5.50

I) 4 Gallons

II) $77

Step-by-step explanation:

30km 1 gallon

420km ?

420 ÷ 30 = 14

? = 40

So, 4 gallons more will be needed to complete the journey.

1 gallon $5.50

14 gallon $?

14 x $5.50 = $77

The cost of the petrol is $77

step-by-step explanation:

answer: solve 5\cdot 2^x=2405⋅2  

x

=2405, dot, 2, start superscript, x, end superscript, equals, 240.

solution

to solve for xxx, we must first isolate the exponential part. to do this, divide both sides by 555 as shown below. we do not multiply the 555 and the 222 as this goes against the order of operations!

\begin{aligned} 5\cdot 2^x& =240 2^x& =48 \\ \end{aligned}  

5⋅2  

x

2  

x

​    

=240

=48

​

step-by-step explanation: