61. A 10 hectare field is reaped by 2 men, 3 women and 4 children together in 10 days. If working capabilities of a man, a woman and a child are in the ratio 5 : 4 : 2, then a 16 hectare field will be reaped by 6 men, 4 women and 7 children in = ?
62. If p men working p hours per day for p days produce p units of work, then the units of work produced by n men working n hours a day for days is = ?
63. If two persons, with equal abilities, can do two jobs in two days then 100 persons with equal abilities can do 100 similar jobs in = ?
64. A is twice as good a workman as B. If they work together, they can complete a job in 18 days. If A alone does the job, in how many days he will complete the job ?
65. A is thrice as good a workman as B and so takes 60 days less than B for doing a job. The time in which they can do the job together is = ?
66. A and B can do a job in 7 days. A is $${\text{1}}\frac{3}{4}$$ times as efficient as B. The same job can be done by A alone in ?
67. A road of 5 m length will be constructed in 100 days. So, 280 workers were employed. But after 80 days it was found that only $${\text{3}}\frac{1}{2}$$ km road was completed. Now how many more people were need to finish the work in the specified time ?
68. If the work done by (x - 1) men in (x + 1) days and the work done by (x + 2) men in (x - 1) days are in the ratio 9 : 10, then the value of x is equal to ?
69. A can do a piece of work in 70 days and B is 40% more efficient then A. Then the number of days taken by B to do the same work is = ?
70. A can do a certain work in 12 days. B is 60% more efficient then A. How many days will B and A together take to do the same job?
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