alleryA can finish a job in 20 days. After working 5 days he leaves. The fraction of work left is:
AThree fourths
BOne fourth
COne half
DFour fifths
Answer & Solution
Correct answer: A. Three fourths
1. A completes one twentieth of the job each day.
2. In 5 days he completes 5 x 1/20 = 5/20.
3. That simplifies to one fourth of the job done.
4. The work remaining is 1 - 1/4.
5. So three fourths of the job is still left. Answering one fourth reports the part finished, not the part left.
_Source: syllabus Maths, Ch 11 'Direct and Inverse Proportions', S11.3 Inverse Proportion_
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