R K Bansal Solutions for Chapter: Direct and Inverse Variations (Including Time and Work), Exercise 4: EXERCISE 10(D)

$8$ Oranges can be bought for $Rs\mathit{.}10.40$. How many more can be bought for $16.90$ ?  

Fifteen men can build a wall in  $60$ days. How many more men are required to build another wall to same size in  $15$  days?
 

if  $10$ horses consume $18$ bushes in $36$ days. How long will  $24$ bushes last for $30$ days. 

$90$ men can complete a work in $24$ days working $8$ hours a day. How many men are required to complete the same work in  $18$ days working  $7\frac{1}{2}$ hours a day?
 

If $70$ men dig $15,000 \mathrm{sq}.\mathrm{m}$ of a field in $5$ days how many men will dig $22,500 \mathrm{sq}.\mathrm{m}$ field in $25$ days?

A contractor undertakes to build a wall $1000 \mathrm{m}$ long in $50$ days. He employs $56$ men, but at the end of $27$ days, he finds that only $448 \mathrm{m}$ of wall is built. How many extra men must the contractor employ. So that the wall is completed in time?

A group of labours promises to do a piece of work in $10$ days but five of them become absent. If the remaining labours complete the work in $12$ days, find their original number in the group

Ten men, working for $6$ days of $10$ hours each, finish $\frac{5}{21}$ of a piece of work. If the number of men working at the same rate and for the same number of hours each day will be required to complete the remaining work in $8$ days if $k$, find $k$.