The following picture is just for fun only...
In a pond, the number of orange goldfish is 8 more than that of black goldfish. If a goldfish is selected from the pond randomly, the probability of selecting a black goldfish is seven over eighteen. How many black goldfish are there in the pond?
A four-digit number is formed by arranging 1, 2, 3 and 5 randomly without repetition. Find the probabilities of the following events.
(a) The thousand digit of the number is 1.
(b) The number is an odd number.
A number is selected at random from the integers 1 to 40 inclusive. Find the probabilities of getting a multiple of 5 or 9.
A letter is chosen from the words THIRTY and EIGHT each. Find the PROBABILITY of choosing two vowels.