Acompany has two large computers. the slower computer can send all the company's email in 45 minutes. the faster computer can complete the same job in 30 minutes. if both computers are working together, how long will it take them to do the job? do not do any rounding.

The first computer's rate is 1/45 email jobs per minute, the second computer's rate is 1/30 email jobs per minute, so presumably they combine for a rate of

1/45 + 1/30 = 2/90 + 3/90 = 5/90 = 1/18 email jobs per minute, so both together do a full job in the reciprocal,

18 minutes

walter needs to make at least 5 more cookies but no more than 40. 5 ≥ x ≥ 40;

step-by-step explanation:

walter has to make a minimum of 20 cookies. he already has 15 cookies made, so he must make 5 more to meet the minimum.

the maximum amount of cookies he can make is 55. he already has 15, so he has to make no more than 40 more cookies to meet the maximum.