81. Ramesh and Rahman can do a work in 20 and 25 days respectively. After doing collectively 10 days of work, they leave the work due to illness and Suresh completes rest of the work in 3 days. How many days Suresh alone can take to complete the whole work ?
82. The ratio of the amount of work done by (x - 1) labours in (x + 1) days and (x + 1) labours in (x + 2) days is 5 : 6. Then the value of x is ?
83. A can do a work in 36 days, B in 18 days and C in 12 days. Every 2nd day B and every 3rd day C, helps A .Then in how many days the work will be completed?
84. A can complete 25% of a work in 15 days. He works for 15 days and then 8 alone finishes the remaining work in 30 days. In how many days will A and B working together finish 50% of the same work?
85. If 450 men can finish construction of an apartment in 20 days, then how many
men are needed to complete the same work in 30 days?
86. A can do $$\frac{1}{3}$$ of a work in 30 days, B can do $$\frac{2}{5}$$ of the same work in 24 days. They worked together for 20 days. C complete the remaining work in 8 days. Working together A, B and C will complete the same work in:
87. X, Y and Z can do a piece of work in 46 days, 92 days and 23 days, respectively. X
started the work. Y joined him after 2 days. If Z joined them after 8 days from the beginning, then for how many days did X work?
88. A, B and C can all together do a piece of work in 10 days, in which B takes 3 times as long as A and C together to do the work. In how many days can B alone do the work?
89. A can do 20% of work in 4 days, B can do $$33\frac{1}{3}\% $$ of the same work in 10 days. They worked together for 9 days. C completed the remaining work in 6 days. B and C together complete 75% of the same work in:
90. A and B can do a job in 10 days and 5 days respectively. They worked together for two days, after which B was replaced by C and the work was finished in the next three days. How long will C alone take to finish 40% of the job?
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