At a pizza shop, 75% of the customers order a pizza, 20% of the customers order a salad, and 15% of the customers order both a pizza and a salad.
If a customer is chosen at random, what is the probability that he or she
orders either a pizza or a salad?
A. 0.15
B. 0.05
C. 0.25
D. 0.015

How to solve a simultaneous equation involved with fractions?

Select the quadratic that has root x = 8 and x = -5

When george started his current job, his employer told him that at the end of the first year, he would receive two vacation days. after each year worked, his number of vacation days will double up to five work weeks (25days) of payed vacation. how many vacation days will he have in 4 years