Mario and julio are working together to detail cars. when they work together, they can wash7 cars in 2 hours. if mario works alone, her can detail 5 cars in 3 hours. if julio works alone, how long would it take him to detail 12 cars?

6.56hours.

Step-by-step explanation:

Given;

Mario and julio can wash 7 cars in 2hours

While only mario can wash 5 cars in 3hours

Let m represent the rate at which mario work

j represent the rate at which julio work

t represent the rate at which mario and jolio combined work.

t = m + j

j = t -m 1

t = 7 cars per 2hours = 7/2 = 3.5cars/hour

m = 5 cars per 3hours = 5/3 = 1.67cars/hour

From eqn 1

j = t -m = 3.5 - 1.67 = 1.83cars/hour

So, to determine the number of time it will take julio to detail 12 cars

Where = number of cars detailed

N = rate × time = j × time

time = N/j

time = 12/1.83

time = 6.56 hours

Therefore, it will take julio to detail 12 cars is 6.56 hours.

step-by-step explanation:

if you want to solve percent error follow these steps.

1. subtract the accepted value from the experimental value.

2. take the absolute value of step 1.

3. divide that answer by the accepted value.

4. multiply that answer by 100 and add the % symbol to express the answer as a percentage.

if you want to solve percent of change just do this.

1. work out the difference (increase) between the two numbers you are comparing.

2. divide the increase by the original number and multiply the answer by 100. if your answer is a negative number then this is a percentage decrease.

hope this : )