book Maths Puzzle Numerical Ability

how many kilograms of coffee beans selling for $2.40 per kilogram should be mixed with 3 KG of cofee beans selling for $4.00 per KG to obtain a mixture selling for $2.88 per KG?

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book Other Question

6. If 6 men can do a piece of work in 14 days, how many men are needed to do the work in 21 days?
a. 3 b. 9 c. 5 d. 4 e. none
The answer on the answer key is D, but I have no clue how to get the same. Please help! Cleveland Corp. has 100,000 shares of common stock outstanding, its net income is 750,000, and its P/E is 8. What is the company's stock price?

a.)$20
b.)$30
c.)$40
d.)$50
e