SOLUTION: 1. Joey Ronan has two investments totaling P15,000. He receives 8% interest from one and 7% interest from the other. The 8% investment yields an annual income that is P150 less tha

Question 574530: 1. Joey Ronan has two investments totaling P15,000. He receives 8% interest from one and 7% interest from the other. The 8% investment yields an annual income that is P150 less than the income from the 7% investment. Find the amount invested at each rate.
2. One pipe can fill a tank in 4 hours. Together with a second pipe, the tank can be filled in 3 hours. How long would it take the second pipe alone to fill the tank??
3. How many ounces of vegetable oil containing 8% saturated fats must be added to 14 ounces containing 20% saturated fats to make a salad dressing containing 15% saturated fats?
*just only use letter x for the unknown. thank you. ^^
Answer by chana(69) (Show Source): You can put this solution on YOUR website!
2. One pipe can fill a tank in 4 hours. Together with a second pipe, the tank can be filled in 3 hours. How long would it take the second pipe alone to fill the tank??
SO I WILL SOLVE ONLY THE SECOND PART
sol:
work done by second pipe = work done by both pipes - work done by one pipe
=( 1/3 ) - (1/4)
= 1/12
so second pipe can fill the tank by 12 hours.
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