The difference of two numbers.(a, b) is 21. the difference of 5 times a and 2 times b is 18. what are the values of a, b?

Which shows the correct solution of the equation 1/2a+2/3b=50, when b=30?

John read the first 114 pages of a novel, which was 3 pages less than 1/3 of the novel. write an equation to determine the total number of pages (p)(p) in the novel.

Asurvey of 2,000 doctors showed that an average of 3 out of 5 doctors use brand x aspirin.how many doctors use brand x aspirin