Materials of equal value for trading

- 1 stone = 4 logs

- 1 brick = 10 logs

- 2 logs = 150 nails

It takes 39 stones and 165 logs to build 3 sheds.

What is the exact number of stones needed to build 5 sheds?

At a pet store, Davina counted 12 parrots out of 20 birds. Which is an equivalent ratio of parrots to birds at the pet store?

The length of a text messaging conversation is normally distributed with a mean of 10 minutes and a standard deviation of 4 minutes. What is the probability that a conversation lasts longer than 20 minutes?

If 8 gallons of gas cost 28.16 how much will 5 gallons of gas cost at the same rating?

A radioactive kind of nitrogen has a half-life of 10 minutes. If you start with 64 grams of the substance, how much will be left after 20 minutes

Simplify the complex fraction 2/3 over 1/3

The area of a triangle is 16a^3b^2c. Find the height if the base has a length of 18a^2b.

Solve each inequality 2>6/6-1

Find the positive value of X that makes the following equation a true number sentence. X to the power of 2 is equal to 4/49

What is the graph of 2x - y = 6 A. (6,-3) B. (-6,-3) C. (-3,-6) D. (3,-6)

12c-4=14c-10 whats the solution