There are 30 students mr. robert's home room 45% of the students ride the bus. how many students ride the bus?

If the square of a positive integer is added to 2 times the integer the result is 48. find the integer.

Find two numbers if their ratio is 4: 7 and their difference is 123.

Zoe paid $18.60 in sales tax in tips for her dinner the sales tax rate is 11% and she tipped 20% what was the price of zoe’s dinner before sales tax and tips