What is the related number in the set of numbers

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

Ruiz needs to buy a countertop for a kitchen. He calculated the area to be 16 square feet. The actual area is 15.4 square feet. What is Ruiz's percentage error? (How do you solve this?)

Victor can wash 2 cars in 8 minutes. At this rate, how long would it take Victor to wash 20 cars? Answer in minutes and without units.

Factorise the completely 3ax+2ay+6bx+4by

What's the sale price of $1200 * 5/6

The ratio of red to green marbles is 3 to 2 there is 36 red marbles how many green marbles are there

Which would the phrase "two times the quotient of a number and 3" look like as a variable expression? 3 n/2 2 n/3 2 (n-3) 3 (n-2)

In 2012 electricity cost 15p per unit. A family used 3729 units. In 2013 electricity cost 17p per unit. The family used 3506 units. How much more did the family pay for electricity in 2013

What times what equals 29 besides 29 times 1

Reggie is making a double-layer cake the recipe for the first layer calls for 2 1/4 cups of sugar. The recipe for the second layer calls for 1 1/4 cups of sugar Reggie has 5 cups of sugar. How much will he have left after making both recipes

The intercept not graph of 9x^2-4y^2=1