# math

posted by .

a piece of limestone weighs 3/5 of a pound. A piece of slate weighs 4/7 of a pound. What is the difference in the weight of the two rocks?

• math -

You need to get a common denominator of
35. Multiply the top and bottom of 3/5 by 7 and multiply the top and bottom of 4/7 by 5. Then, keep the denominator and subtract the numerators to give you the difference in weights.

## Similar Questions

1. ### math

rockfish is on sale for \$3.29 a pound. how much a piece that weighs 0.75 pound cost?
2. ### math

sparky weighs 3/4 of her weight, plus 3/4 of a pound. how much does she weight?
3. ### GED-Word Problems

Each piece of candy weighs 1/8 pound. If Donna buys 15 pieces, how many pounds of candy will she buy?
4. ### Math

A delivery service charges a base price for an overnight delivery of a package plus an extra charge for each pound the package weighs. A customer is billed \$22.85 for shipping a 3-pound package and \$40 for shipping a 10-pound package. …
5. ### algebra 2

Isabella shipped a 5-pound package for \$4. She shipped a 3-pound package for \$3.60 and a 1-pound package for \$3.20. A 10-pound package cost \$5 to ship. The shipping cost follows a pattern based on the weight of the package. Which expression …
6. ### math

eva wants to make two pieces of pottery.she needs 3/5 pound of clay for one piece and 7/10 pound of clay for the other piece.she has three bags of clay that weigh 4/5 pound each.how many bags of clay will eva need to make both pieces …
7. ### math

eva wants to make two pieces of pottery. She needs 3/5 pound of clay for one piece and 7/10 pound of clay for the other piece. She has three bags of clay that weigh 4/5 pound a piece. How many bags of clay will eva need?
8. ### Math

I am also having trouble figuring out the below: Eva wants to make two pieces of pottery. She needs 3/5 pound of clay one piece and 7/10 pound of clay for the other piece. She has three bags of clay that weigh 4/5 pound each. How many …
9. ### Math Help

I am having a lot of difficulty please help. Eva wants to make two pieces of pottery. She needs 3/5 pound of clay for one piece and 7/10 pound of clay for the other piece. She has three bags of clay that weigh 4/5 pound each. How many …
10. ### Math

Eva wants to make two pieces of pottery.She needs 3/5 pound of clay for one piece and 7/10 pound of clay for the other piece.She has three bags of clay that weigh 4/5 pound each.How many bags of clay will Eva need to make both pieces …

More Similar Questions