4workers require 5.5 m of mortar for 3 days when working 8 hours a day.
how much m mortar can 6 workers work by working 2 hours each 10 hours?

Find two numbers if their sum is 91 and the ratio is 6: 7?

According to a study conducted in 2015, 18% of shoppers said that they prefer to buy generic instead of name-brand products. suppose that in a recent sample of 1500 shoppers, 315 stated that they prefer to buy generic instead of name-brand products. at a 5% significance level, can you conclude that the proportion of all shoppers who currently prefer to buy generic instead of name-brand products is higher than .18? use both the p-value and the critical-value approaches.

|p| > 3 {-3, 3} {p|-3 < p < 3} {p|p < -3 or p > 3}