Certificate Of Deposit California

July 19th, 2010

certificate of deposit california
Question: ♥||plz plz plz help me solve these. DONT GIVE ME THE FULL ANSWER; JUST THE STEPS.?

How much pure acid should be mixed with 4 gallons of a 50% acid solution in order to get an 80% acid solution?

On a road trip, five friends drove at 55 miles per hour to California. On the way home, they took the same route but drove 70 miles per hour. How many miles did they drive on the way to California if the round trip took 10 hours?

Kevin invested part of his $10,000 bonus in a Certificate Of Deposit that paid 6% annual simple interest, and the remainder in a mutual fund that paid 11% annual simple interest. If his total interest for that year was $900, how much did Kevin invest in the mutual fund?

Sally is making a cover for a round table. When finished, the cover will fit exactly with no excess hanging off. Sally has to cut the fabric circle with a 4 inch larger diameter than the table to allow for hemming. If the table has a diameter of 70 inches, how much fabric does Sally need? (Use 3.14 for pie. Round to 2 decimal places.)

thnks.

Answer: 1.
(4 gallons) x (50% concentration) + (?gallons) x (100% concentration) = (4+? gallons) x (80% concentration)

let 50% = 50 this is allowed as all of this is relative
and let ? = X

4×50 + 100X = 80(4+X)
200 +100X = 320 + 80X
20X = 120
……………

if you let 50% = 0.5 it would produce the same answer

2008 Mexico Immersion