Answer:
this is as test
Step-by-step explanation:
Answer: Option C)1 over 15 minus 1 over x equals 1 over 20
Explanation:
Since, Micah can fill a box with books in 15 minutes.
Therefore, the work done by Micah in one minute= 1/15
Also, Sydney takes the books out puts them on a shelf.
And the times taken by Micah when Sydney is also taking the books outside from the self= 20 minutes
Therefore, the work done by Micah in one minute when Sydney taking books out of the box= 1/20
Let Sydney alone takes x minutes to take books outsides the shelf.
Then, work done by Sydney in one minute=1/x
Thus, the work done by Sydney( by taking books out of the box)= the work done by Micah - work done by Micah and Sydney simultaneously= 1/15-1/20
⇒1/x=1/15-1/20
⇒1/15-1/20=1/x
⇒1/15-1/x=1/20 is the required expression.
Therefore, Option C is correct.
Answer:
6 x + 23 y < $ 680 represents the combinations of x balls and y nets that can be purchased.
Step-by-step explanation:
The number of balls than can be purchased = x
The number of nets than can be purchased = y
Total savings = $ 680
Now, the cost of 1 ball =$6
So, the cost of x balls = x ( cost of 1 ball) = x ( $6) = 6 x
Also, the cost of 1 net =$23
So, the cost of y nets = y ( cost of 1 net = y ( $23) = 23 y
So, the total amount spent on x balls and y nets
= Amount spent on x balls + Amount on y nets
= 6 x + 23 y
Also, the saved amount is $680
⇒<u> 6 x + 23 y < $ 680</u>
Hence, 6 x + 23 y < $ 680 represents the combinations of x balls and y nets that can be purchased.
