What is the related number in the set of numbers

10:15 20:30 30:45 40:60

One third of your class of 18 students likes vanilla frozen yogurt. How many students in your class like vanilla frozen yogurt?

If I buy one 6-pack of soda can fizzy candy for $1.25 Then how much will it be if I bought 25 6-packs of the candy.

A case of chocolate contains 15 chocolate bars. The chocolates come in three varieties milk, dark, and milk/dark mix. 6 milk chocolates and 3 dark chocolates become expired.

The quotient k and 22 is - 66.

The orbit of earth around the sun is about 5.8 X 10^8, while pluto's orbit is about 2.3. X 10^10 miles. About how many miles longer is pluto's orbit than earth's orbit?

The sum of a block of land's length and width is 30m. If x = the width the expression for the land's length is 30 - x. Given the length and width must be positive values, solve an appropriate inequality to find the possible values of x.

Jacqueline wants to travel to Oregon. She rents a car for $50, plus $0.10 per miles. Jacqueline paid a total of $195. How many miles did she drive?

25 1/2 divided by 6 In this math equation I don't know how to do it

What is three and one-eights minus one and seven-eights?

Solve 5x-4=5 (x-3) + 11