If a school bought 1,000 erasers as part of an order for supplies. the total cost of the erasers was $30. what was the cost for 1 eraser?

Acollection of coins has value of 64 cents. there are two more nickels than dimes and three times as many pennies as dimes in this collection. how many of each kind of coin are in the collection?

The measures of the legs of a right triangle are 15m and 20m . what is the length of the hypotenuse

Mrs. blake's bill at a restaurant is $42.75. she wants to leave the waiter an 18% tip. how much will she pay in all, including the tip?