Maxine want a necklace 28 beads long in a ratio of 4: 10 ,how many red and blue beads does maxine need?

The perimeter of a rhombus with a side of 6 is 24

How to do this , and can some one explain

At a pizza shop 70% of the customers order a pizza 25% of the customers order a salad and 15% of the customers order both a pizza and a salad if s customer is chosen at random what is the probability that he or she orders either a pizza or a salad