Question

1. Tony alone can paint a wall in 7 days and his friend Roy alone can paint the same wall in 9 days. In how many days they can paint the wall working together? Round off the answer to the nearest integer.
a. 3
b. 4
c. 5
d. 7; 1. Tony alone can paint a wall in 7 days and his friend Roy alone can paint the same wall in 9 days. In how many days they can paint the wall working together? Round off the answer to the nearest integer.; a. 3; b. 4; c. 5; d. 7

Answer 1

Work done by Tony in 1 day = 1/7

Work done by Roy in 1 day = 1/9

Work done by Tony & Roy in 1day = ( 1/7 + 1/9 ) = 16/63

Therefore Tony & Roy can complete the work in 63/16 days = 4 days (approximately)

So your answer is option b.

Hope this helps you friend..

Be brainly

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Answer 2

Option b, 4 is the answer.....