summer1350

Thanks Achilles and Zulkarnain. :) @ Achilles: I found a solution to a similar coin problem posted above. But somehow, I can't relate this to that. Only dimes have been asked here. Please go through the following: Laura has 20 coins consisting of quarters and dimes. If she has a total of $3.05, how many dimes does she have? (A) 3 (B) 7 © 10 (D) 13 (E) 16 Let D stand for the number of dimes, and let Q stand for the number of quarters. Since the total number of coins in 20, we get D + Q = 20, or Q = 20 - D. Now, each dime is worth 10 cents, so the value of the dimes is 10D. Similarly, the value of the quarters is 25Q = 25(20 - D). Summarizing this information in a table yields Dimes Quarters Total Number D 20 - D 20 Value 10D 25(20 - D) 305 Notice that the total value entry in the table was converted from $3.05 to 305 cents. Adding up the value of the dimes and the quarters yields the following equation: 10D + 25(20 - D) = 305 10D + 500 - 25D = 305 -15D = -195 D = 13 Hence, there are 13 dimes, and the answer is (D).

I need help with the following two problems which are in Allegations and mixtures concept. 1. If a man decides to travel 72 miles in 8 hours partly by foot and partly on a bicycle, his speed of foot being 8 mph and that on bicycle being 10 mph. What distance would he travel on foot? (A) 24 miles (B) 32 miles © 48 miles (D) 64 miles (E) Cannot be determined 2. A sum of $80 is made up of 80 coins that are either dimes or quarters coins. Find out how many dimes or quarters coins are there in the total amount? (A) 10 (B) 20 © 30 (D) 40 (E) 50

Thank you :)

Can anyone please help me with the following question: An electronic device makes beep every 60 sec. Another device makes a beep after every 62 sec. They beep together at 10 AM. The time when they will next make a beep together at the earliest is: A) 10.30 AM B) 10.31 AM C) 10.59 AM D) 11 AM E) 11.05 AM