Asked by otutu
in a class of 60 student,64 passed biology and 42 passed chemistry.every student passed at least one of the two subjects.How many student passed in both subject?
Answers
Answered by
Ms. Sue
Please proofread your question.
How can 64 out of 60 students pass biology?
How can 64 out of 60 students pass biology?
Answered by
Damon
42 - both = chem alone
64 - both = bio alone
chem alone + bio alone + both = 60
both = b
chem alone = c
bio alone = d
so
42 - b = c
64 - b = d
-------------subtract
-22 = c-d
c+d+b = 60
c+ b = 42
-----------------subtract
d = 18
then b = 64 - d = 46
NOTE - impossible BECAUSE you have a typo
In a class of 60, 64 did NOT pass biology :)
However this is how to do it when you get it right.
64 - both = bio alone
chem alone + bio alone + both = 60
both = b
chem alone = c
bio alone = d
so
42 - b = c
64 - b = d
-------------subtract
-22 = c-d
c+d+b = 60
c+ b = 42
-----------------subtract
d = 18
then b = 64 - d = 46
NOTE - impossible BECAUSE you have a typo
In a class of 60, 64 did NOT pass biology :)
However this is how to do it when you get it right.
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