if 9/20 of a class spoke a second language and 4/5 of those that speak a second language speak spanish, what percentage of the class speaks spanish?

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

Acar started driving from city a to city b, distance between which is 620 miles, at a rate of 60 mph. two hours later a truck left city b and started moving towards city a at a rate of 40 mph. how many hours after the truck's departure will the two meet?

Which radical expression is a rational number? a. √ 360 b. √ 644 c. √ 225 d. √ 122