‘A’ is thrice as good a workman as ‘B&rsqu

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CDS-II 2018 Elementary Math(PYSP)
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MATH

87

M: +1.00/-0.33

‘A’ is thrice as good a workman as ‘B’ and takes 10 days less to do a piece of work than ‘B’ takes. The number of days taken by ‘B’ alone to finish the work is

[CDS-II 2018 Elementary Math(PYSP)]

A 12

B 15

C 20

D 30