A number cube with faces numbered 1, 2, 3, 4, 5, 6 is rolled. Find the probability of obtaining a number greater than 4.

(a)  

What is the probability of drawing a ball that is not red if a bag has 4 red balls, 5 blue balls, and 10 green balls?

(a)  

There are 20 sweets in a box. The probability that a chocolate is picked at random from the box is ½ or 50%. How many chocolates are in the box?

(a)  

Sabrinah has 12 cards, each with a shape on it. She takes a card at random. If the probability of drawing a card with the shape of a star is ¼, how many cards have the shape of a star?

(a)  

There are 18 pens in a bag. If the probability of getting a black pen is 2/3, how many black pens are there?

(a)