Question

A can do a
piece of work in 21 days. B as 75%
more efficient than A. Find the number of days B will
take to do the same work.​

Answer 1

Answer:

28 days

Step-by-step explanation:

21 = 75% of days of B

LET DAYS OF B BE k

$21 = \frac{75 }{100} \times k \ \\ \: \: \: \: \: \: \: \: \: \: 21 \times 100 = 75 \times k \\ 2100 = 75k \\ \ \frac{2100}{75} = k \\ 28 = k$

therefore,it takes 28 days for B eorker