Numerical Appli...

$$15$$ men can build a wall in $$60$$ days. How many more men are required to build another wall of same size in $$45$$ days?

A and B together can do a piece of work in $$ 6\dfrac{2}{3} $$ days , but B alone can do it in $$10$$ days. How long will A take to do it alone ?

Shrikant reads the following number of pages of a book daily. Find the mean.
$$34, 43, 29, 51, 36, 41, 38, 35, 34, 36, 34, 38, 40, 36, 35,$$ 

The mean of $$3, a+ 2, 8, 12, 2a -1$$ and $$6$$ is $$7$$, find the value of $$a$$.

If $$10$$ horses consume $$18$$ bushels in $$36$$ days. How long will $$24$$ bushels last for $$30$$ horses?

Twelve typists , all working with same speed type a certain number of pages in $$18$$ days working $$8$$ hours a day . How many hours per day must sixteen typists work in order to type the same number of pages in $$9$$ days?

$$X$$ can do a piece of work in  $$24$$ days, while $$Y$$ alone can do it in $$16$$  days. With the help of $$Z$$ they finish the work in $$8$$ days.
Find in how many days $$Z$$ can do the work alone?

The mean monthly salary of the $$12$$ employees of a firm is Rs. $$1450$$. If one more person joins the firm who gets Rs. $$1645$$ per month, what will be the mean monthly salary of $$13$$ employees?

$$12$$ men can complete a piece of work in $$16$$ days. How many days will $$4$$ men take to complete the task?

$$16$$ men can complete a piece of work in $$8$$ days. In how many days can $$12$$ men complete the same piece of work?