A city has 3 new houses for every 9 old houses. If there are 21 new houses in the city, how many old houses are there?

The CD Recyclery sells used CDs for $10 each and buys them for $6 each. Bob paid $20 when he bought and sold the same number of CDs. How many CDs did he buy?

Janice is babysitting this summer and begins her first week with $35 in her account. If she makes $25 each week, which sequence shows how much money she has for the beginning of the first five weeks?

Is the relationship between minutes and depth additive or multiplicative

At a daycare, 0.26 of the children are boys. what percentage of the children are boys?

What is the quotient of 3/7

Leonard used 2/7 of his paycheck to pay his cell phone bill. How much was Leonard's cell phone bill?

Martinez Corp. uses a perpetual inventory system. Data for product E2-D2 include the purchases shown below. Date Number of Units Unit Price May 7 44 $16 July 28 33 21 On June 1, Martinez Corp. sold 22 units, and on August 27, 33 more units.

Circle E has a radius of 40 inches with = 324°. Find the exact length of

In the number 28,429 how many times greater is the value of the two in the 10,000's place compared to the value of a two in the tens place

How to solve 2x 4=17 step by step?