Rocky mcfist spends a total of $90 per week for karate lessons and ballet lessons. if the amount spent on karate lessons increases $10 per week, it will be two thirds of the amount spent on ballet lessons. how much does rocky spend on ballet lessons?

Let x be the amount of money spent on karate lessons and y be the amount of money spent on ballet lessons (both per week).

1. Rocky Mcfist spends a total of $90 per week for karate lessons and ballet lessons. Then

2. If the amount of money spent on karate lessons increases $10 per week, then it becomes x+10. It will be two thirds of the amount spent on ballet lessons, then

3. Solve the system of equations:

From the second equation

Substitute this expression into the first equation

Then

Rocky spend on ballet lessons $60 per week.

solution:

as, mean is defined as sum of all the observations divided by total number of observations.

and , median is mid value of the data whether arranged in ascending order or descending order.

consider, roadsters:

2,3,4,5,6,7,8,9

mean =

also, median= , because number of observations is even, so median is mean of two mid values.

now, coming to bandits

2,3,4,5,6

mean =  

median = 4, as number of observations is odd.

so, roadsters has greater median as well mean than bandits.

→option a is true about the repairs performed on 2 types of cars:

bandits have lower median and mean than roadsters.

tangent

step-by-step explanation: