7 men build a house in 300 days. how many men, working at the same rate, can build the house in 70 days?

Quick! what is the area of this trapezoid?

One-third of the people from country a claim that they are from country b, and the rest admit they are from country a. one-fourth of the people from country claim that they are from country a, and the rest admit they are from country b. in a combined census of the two countries, one-half of the total claimed to be from a. what is the ratio of the populations of country a to that of country b.

The circumference of a circle is 5 pi cm. what is the area of the circle?