x  +  (x – 2)  +  (x – 3)  = 1 
6  12  18 
(6x + 3x – 6 + 2x – 6)  = 1 
36 
x =  48  = 4  4  days 
11  11 
Akshat's efficiency =  1 
15 
Anju's efficiency =  1 
9 
less % = 

× 100  

=  6  × 9 × 100 = 40% 
135 
1 day's work =  90  = 6 
15 
1 day's work =  63  = 7 
9 
Increased efficiency =  (7 – 6)  × 100 
6 
= 16  2  % 
3 
Anmol's and Akhil's 1 day work =  1  +  1 
8  10 
Anmol's and Akhil's 3 day work =  (  1  +  1  )  × 3 
8  10 
=  (5 + 4)  × 3 =  27 
40  40 
Remaining work = 1 –  27  =  13 
40  40 
Ananya's and Akhil's 1 day work =  1  +  1 
16  10 
Time to complete the work =  13  ÷  (  1  +  1  ) 
40  16  10 
=  13  ÷  13  = 2 days 
40  80 
Aishwariya's and Akhil's 1 day work =  1  +  1 
10  10 
Time to complete the work =  13  ÷  (  1  +  1  ) 
40  10  10 
=  13  ÷  1  =  13  days 
40  5  8 
Difference = 2 –  13  =  3 
8  8 
Aishwariya and Anmol can do the work =  1  
1  +  1  
10  8 
=  9  =  40  days 
(9/40)  9 
Akash and Arushi can do the work =  1  
1  +  1  
18  12 
=  1  =  36  days 
(5/36)  5 
Ratio =  40  :  36  = 50 : 81 
9  5 