Three postal workers can sort a stack of mail in 20 minutes, 25 minutes, and 100 minutes, respectively. Find how long it takes them to sort the mail if all three work together.

The answer must be a whole number

What is the answer to (14-5) / (9-6) =

Solve the quadratic equation by completing the square. x2 + 6x - 5 = 0 A) x = 3 ± 14 B) x = 1 ± 11 C) x = - 3 ± 14 D) x = - 1 ± 11

Let R be a ring with identity and let S be a subring of R containing the identity. Prove that if m is a unit in S then u is a unit in R. Show by example that the converse is false.

What is the sum of this mathematical question: 7.4 + 6.8

1. Find the present value. Amount per Payment: $820 Payment at the End of Each: 6 months Number of Years: 14 Interest Rate: 5% Compounded: Semiannually

Meredith picked 4 times as many green peppers as red peppers. If she picked a total of 20 peppers, how many green peppers did she pick?

Find diameter and radius if c = 43m

A flower bed has the shape of a rectangle 7 yards long and 4 yards wide. what is its area in square feet

A store buys 77 1 2 pounds of mulch in a large shipment. They divide the mulch up into bags that can each hold 2 1 4 pounds. The store sells one bag of mulch for $2.25. For each part of the question, show your work.

Which one of these is not like the other 25,60,35,20,22