600 students took the test on Physics and chemistry. 35% students failed in Physics and 45% students failed in chemistry and 40% of those who passed in chemistry also passed in Physics, then how many students failed in both :
A.16
B.15
C.13
D.12
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Physics failed = 35%,Pass = 65%
Chemistry failed = 45%, Pass = 55%, Both Pass = 40% of 55% = 22%
Total failed = 78%
so,
78% = 35%+ 45% - both
both = 2%
600 of 2%
= 12 students
☜☆☞
Chemistry failed = 45%, Pass = 55%, Both Pass = 40% of 55% = 22%
Total failed = 78%
so,
78% = 35%+ 45% - both
both = 2%
600 of 2%
= 12 students
☜☆☞
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