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MATH QUESTION OF THE DAY 


A bag contains 20 copper and 10 brass coins. If 9 of the coins are removed, how many copper coins are left in the box?
(1) Of the removed coins, the ratio of the number of copper coins to that of brass coins is 2 : 1 (2) Four of the first six coins removed are copper.
A. Statement (1) ALONE is sufficient but Statement (2) ALONE is not sufficient. B. Statement (2) ALONE is sufficient but Statement (1) ALONE is not sufficient. C. BOTH Statements TOGETHER are sufficient, but NEITHER Statement alone is sufficient. D. Each Statement ALONE is sufficient. E. Statements (1) and (2) TOGETHER are NOT sufficient.






Student: 2/9/2010 8:34:28 AM 

A 





Student: 2/9/2010 11:41:37 AM 

A. C + B = 9 C/B = 2 Solving above gets C = 6 and B = 3 Therefore, Statement(1) is sufficient.
Statement(2) is not sufficient as it only states first six coins are copper coins. The rest of the removed could be 3(or 2 or 1) copper or no copper
Thus, A is the choice. 





Student: 2/11/2010 4:03:04 AM 

a 





Student: 2/21/2010 4:37:19 AM 

a 










Answer 











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