An unpainted wall with a total area of 100 square feet needed to be painted with three coats of paint. Nelson began the job by painting an area of 60 square feet. Then, Jamaica painted a total area of 70 square feet. Finally, Bryan painted a total area of 80 square feet. Aȇer Bryan finished painting, an area of q square feet of the wall was covered in three coats of paint. If the entire surface area of the wall had received at least one coat of paint, which of the following specifies all the possible values of q ?
(A) 0 ≤ q ≤ 50
(B) 0 ≤ q ≤ 60
(C) 10 ≤ q ≤ 50
(D) 10 ≤ q ≤ 55
(E) 10 ≤ q ≤ 60
For this question why isnt <=60? When i do it through a diagram i shade the 60, then 70 overlaps the 60 leaving 10 of just 70 to be 1 layer of paint, 20 of no layers then 80 comes in distributed over the 20 of no paint and and remaining 60 can be on the one with 2 layers
WA@van3671
I dont follow you method, you got the difference and divided it by 7 but the question asks for how many such 3 digit number exists. How come your approach works ? please explain
As per me the answer is E