Admission to a concert is $20. It costs an additional $7.50 for each T-shirt you bought. You spent a total of $57.50 at the concert. How many T-shirts did you purchase at concert?

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

Jonathan can type 20 documents in 40 minutes ,and susan can type it in 30 minutes and jack can type it in 24 minutes working together ,how much time will it is take them type the same document

Isaac wants the equation below to have no solution when the missing number is placed in the box. which number should he place in the box?