What quantity of a 80% acid solution must be mixed with a 30% solution to produce 300 mL of a 50% solution? Solution:- 120
Month: June 2015
Problem 790
A woman earns 10% more than her husband. Together they make $72,660 per year. What is the husband’s annual salary? Solution:- 34600
Problem 789
What annual rate of interest would you have to earn on an investment of 231.00 interest after 1 year? Solution:- 7.7
Problem 788
Linh has obtained scores of 88, 79, and 73 on her midterm algebra exams. If the final exam counts twice as much as a midterm, what score must she make on her final…
Problem 787
A cell phone company charges a monthly fee of 32.20. How many text messages did she send that month? Solution:- 2061 text messages
Problem 786
Kiran drove from Tortula to Cactus, a distance of 273 mi. She increased her speed by 5 mi/h for the 396 mi trip from Cactus to Dry Junction. If the total trip took 16 h, what was her…
Problem 785
A salesman drives from Ajax to Barrington, a distance of 152 mi, at a steady speed. He then increases his speed by 14 mi/h to drive the 183 mi from Barrington to Collins. If the second…
Problem 784
An antique table in value according to the function v(x) = 650(1.07)x dollars, where x is the number of years after 1980. A) How much was the table worth in…
Problem 783
A random variable represents the number of successes in 30 Bernoulli trials, each with probability of success p =0.5. A) Find the mean and standard deviation of the random variable.…
Problem 782
If a true-false test with 15 questions is given, what is the probability of scoring A) Exactly 80% just by guessing? B) 80% or better by just guessing? Solution:-…
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