Question

joseph and peter can complete a work in 20 hours and 25 hours respectively find work left after they worked to gether for 4 hours

Answer 1

Answer:

Joseph can do a work in 20 hours

Peter can do the same work in 25 hours

Now Joseph’s  1 hour’s work = 1/20

And Peter’s  1 hour’s work = 1/25

Both’s  1 hour’s work = 1/20 + 1/25

= (5 + 4)/100

= 9/100

(i) Both’s  4  hours work  = 9/100 × 4 = 9/25

(ii) Work  left  = 1 – 9/25

= (25 – 9)/25

= 16/25

(iii) Peter can do 16/25 work in = 25 × 16/25

= 16 hours