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15 Jul 2021, 08:30
Kudos
Bookmarks
B
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
65%
(hard)
Question Stats:
61% (02:03) correct
39%
(02:04)
wrong
based on 266
sessions
History
Date
Time
Result
Not Attempted Yet
\(7(19.99) + 3(19.95) =\)
A 7(19.98) + 3(19.96)
B 8(20.00) + 2(19.89)
C 9(20.00) + 19.89
D 9(20.00) + 19.79
E 10(19.97)
A 7(19.98) + 3(19.96)
B 8(20.00) + 2(19.89)
C 9(20.00) + 19.89
D 9(20.00) + 19.79
E 10(19.97)
15 Jul 2021, 08:44
Kudos
Bookmarks
\(7(19.99) + 3(19.95) = 7(20-0.01) + 3(20-0.05) = 7*20 - 0.07 + 3*20 - 0.15 = 200 - 0.22\)
Watching the options the only valid is B because:
\(8*20 + 2(19.89) = 8*20 + 2(20 - 0.11) = 8*20 + 2*20 - 0.22 = 200 - 0.22\)
Watching the options the only valid is B because:
\(8*20 + 2(19.89) = 8*20 + 2(20 - 0.11) = 8*20 + 2*20 - 0.22 = 200 - 0.22\)
18 Jul 2021, 05:56
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Bunuel
Option B and option D can be the answer logically. Consider the difference from the orginal equation.
Option B = 0.07 (7*0.01)+0.05 (20-19.95) - 2*0.06(19.95-19.89) = 0.12-0.12=0 ---> Correct
Option D = 0.07+2*0.5- 0.16(19.95-19.79) = 0.17-0.16=0.01 -----> Not correct.
PS : I made a mistake by not checking option B and proceeded with D assuming that 0.01 wont matter.
