Bobby had a party while his parents were away for the weekend. Bobby estimated that if his 9 friends help him to clean the house, they will be able to finish cleaning in 8 hours before his parents return. After two hours of cleaning, Bobby's parents call and say they are just two hours from home. How many more friends does Bobby need to call for help to finish cleaning in time?

Using an inverse rule of three, it is found that Bobby needs to call 18 more people.

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The rule of three is:

9 people - 6 hours

x people - 2 hours.

Multiplying by line:

Already has 9 people, in total needs 97, so he needs to call 27 - 9 = 18 more people.

A similar problem is given at link

Here, we are required to determine how many more friends does Bobby need to call for help to finish cleaning in time.

Bobby needs 18 more friends to help finish the cleaning in time.

The question above can be solved by ratios and proportions: As such;

Since 9 friends can finish in 8 hours;

After 2 hours, they must have completed 25 % (i.e 1 quarter of the job).

As such, the 9 friends now need 6 hours to complete the rest of the cleaning.

However, since the parents are now 2 hours from home;

Let the number of friends Bobby needs to complete the job in 2 hours be x.

Since;

9 friends take 6hours to complete the cleaning,

then, In 2 hours, Bobby needs, x = (9×6)/2 friends to complete the job.

Ultimately, Bobby needs 27 friends to complete the cleaning in 2 hours.

However, since Bobby has 9 friends on the cleaning already, he needs (27 - 9) = 18 friends more to complete the cleaning in 2 hours.

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i dont know

step-by-step explanation:

why didnt you study

the system of inequity is

step-by-step explanation:

from the given graph it is noticed that we have two related lines. one is solid and another is dashed.

if a line passing through two points, then the equation of line is

the solid line passing through the points (0,4) and (4,0).

the related equation of solid line is .

similarly, find the related equation of dashed line. the dashed liune passing through the points (0,0) and (3,1).

the related equation of dashed line is

from the given graph it is noticed that the point (0,1) lies on the shaded region, therefore the point (0,1) must be satisfied by the related equations.

check the related equations by the point (0,1).

this statement is true if the sign of inequality is < instead of equality. since it is an solid line therefore the sign of inequality will be . the required inequality is

similarly, check the second related equation.

it is a dashed line, so this statement is true if the sign of inequality is > . the required inequality is