A science dass has a total of 40 students. The number of females is 16 less than the number of males. How many males and how many females are in the class?

Celeste wants to have her hair cut and permed and also go to lunch. she knows she will need $50. the perm cost twice as much as her haircut and she needs $5 for lunch. how much does the perm cost?

This summer the number of tourists in salem increased 4.5% from last years total of 426000. how many more tourists came to salem this summer

Luisa sells stuffed animals. she sells her stuffed elephant for $34.90, and the sales tax is 6% of the sale price. about how much is the sales tax on the elephant?