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Updated on: 16 Sep 2021, 11:16
Originally posted by ostrick5465 on 16 Sep 2021, 09:38.
Last edited by ostrick5465 on 16 Sep 2021, 11:16, edited 3 times in total.
Last edited by ostrick5465 on 16 Sep 2021, 11:16, edited 3 times in total.
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A
Be sure to select an answer first to save it in the Error Log before revealing the correct answer (OA)!
Difficulty:
35%
(medium)
Question Stats:
73% (02:07) correct
27%
(02:46)
wrong
based on 146
sessions
History
Date
Time
Result
Not Attempted Yet
The whole class must take a math test consisting of 3 problems. The class teacher reported to the school that: the whole class could solve at least one problem, in the class, 20 students solved the first problem, 14 students solved the second problem, and 10 students solved the third problem. 6 students solved the first and third problems, 5 students solved the second and third problems, 2 students solved the first and second problems, only one student solved all three problems. How many students are there in that class?
A. 32
B. 33
C. 36
D. 37
E. 39
A. 32
B. 33
C. 36
D. 37
E. 39
16 Sep 2021, 10:08
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ostrick5465
Please name the topic as first few words of the question.
All three problems = 1
Only 1st and 2nd = 2-1 =1
Only 1st and 3rd = 6-1 =5
Only 3rd and 2nd = 5-1 =4
Only 1st = 20-1-1-5 = 13
Only 2nd = 14-1-1-4 = 8
Only 3rd = 10-1-4-5 = 0
Total = 1+1+5+4+13+8+0 = 32
A
16 Sep 2021, 10:47
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chetan2u
HI chetan2u how did u find only first , only 1st will be = 20 -(only 1st and 2nd + only 1st and 3rd + all three.)
How do we get only 1st and 3rd to be 0?
