Arecent survey found that 7 out of 9 students eat lunch once a week. if 450 students were surveyed, how many eat school lunch at least once a week

Jenisey has $24 to spend on seven pencils. after buying them she had $10. how much did each pencil cost.?

In priyas math class there are 10 boys and 15 girls. what is the ratio of boys to girls in priyas math class? express your answer as a decimal

You are standing next to a really big circular lake. you want to measure the diameter of the lake, but you don't want to have to swim across with a measuring tape! you decide to walk around the perimeter of the lake and measure its circumference, and find that it's 400\pi\text{ m}400? m. what is the diameter dd of the lake?