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20 Apr 2022, 02:00
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C
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
25%
(medium)
Question Stats:
80% (01:21) correct
20%
(01:25)
wrong
based on 84
sessions
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A tourist has travelers’ checks in $20 and $100 denominations. How many $20 checks are there?
(1) If half of the $20 checks is spent, the remaining amount is $520.
(2) The total value of the checks is $740.
(1) If half of the $20 checks is spent, the remaining amount is $520.
(2) The total value of the checks is $740.
NCC
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21 May 2022, 21:50
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Let x be number of 20$ cheques and y be number of 100$cheques
1) x/2*20 +100y = 520
Can't find x by this equation
1 not sufficient
2) 20x + 100y = 740
Can't find x with this equation so 2 not sufficient
Together) 2 equations 2 variables, sufficient
10x + 50y = 370
10x + 100y = 520
x = 22 ; y = 3
Posted from my mobile device
1) x/2*20 +100y = 520
Can't find x by this equation
1 not sufficient
2) 20x + 100y = 740
Can't find x with this equation so 2 not sufficient
Together) 2 equations 2 variables, sufficient
10x + 50y = 370
10x + 100y = 520
x = 22 ; y = 3
Posted from my mobile device
TheGraceful
22 Jul 2022, 23:04
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Bunuel
Let x= Number of $20 denominations
Let y= Number of $100 denominations
Statement (1):
20(x/2)+100y=520
i.e. 10x+100y=520
i.e. x+10y=52 <=== Two variable and one equation, clearly Not sufficient. (Eliminate A & D)
Statement (2):
10x+100y=740
i.e. x+10y=74 <=== Two variable and one equation, clearly Not sufficient. (Eliminate B)
Combining (1) & (2):
x+10y=52
x+10y=74
Same variable resulting in 2 different values that means values of y & x are changing(are different in different equations).
Not sufficient and hence Answer is E.
Bunuel , chetan2u, nick1816,
where did I go wrong...?
