Wednesday, February 11, 2009
Data Sufficiency - 53
Answer: D
From statement (1): Square root of a number less than 1 is also less than 1 - sufficient
From statement (2): Reciprocal of any number less than 1 is greater than the number - sufficient
Data Sufficiency - 52
1) y/ x > y
2) x^3 > x^2
Answer: B
From statement (1): y/x > y
=> y > xy
=> y(1-x) > 0
y>0 when x is less than 1 or y<0 when x is greater than 1 ---- hence insufficient
From statement (2): x^3 > x^2
=> x^2(x-1) > 0
=> x^2 >0 and x>1
Since x>1, 1/x can not be greater than 1 ---- hence sufficient
Hence B
Monday, January 12, 2009
Data Sufficiency - 51
1). If the selling price per coat had been twice as much, the store's gross profit on the 20 coats would have been 2400
2). If the store selling price per coat had been $2 more, the store's gross profit on the 20 coats would have been 440
Answer: B
Suppose the cost of each coat = x
Suppose sales price = y
=> Total cost = 20x and sales price = 20y
We are required to find the profit: 20(y-x).
From statement 1): It is given that 20(2y-x)=2400
Doesn't helps to find out 20(y-x) --- insufficient
From statement 2): It is given that 20(y+2-x) = 440,
=> 20(y-x) = 400 --- sufficient
Hence B
Problem Solving - 56
A) 2951
B) 8125
C) 15600
D) 15302
E) 18278
Answer: E
Total ways to pick a 3 letter code = 26*26*26 = 26^3
Total ways to pick a 2 letter code = 26*26 = 26^2
Total ways to pick a 1 letter code = 26
Thus total stocks: 26^3 + 26^2 + 26 = 26(26^2 + 26 + 1) = 18278