A man worked 14 hours a day for the first 2 days, 12 hours a day for the next 3 days but did not work on the sixth day. Then on the average how much did he work in the first six days ?

$$84 \div [50 - \left\{4^3 - (30 - 128 \div \overline{8 \times 4})\right\}] = ?$$

A wholesaler sold a water purifier at a loss of 40%. If the selling price has been increased by Its. 125, then wholesaler will get the profit of 10%. What was the cost price of the purifier?

12 men and 18 boys working $$7\frac{1}{2}$$ hours a day can do a certain work in 60 days. If one man works equal to 2 boys. Then the number of boys required to help 21 men to do twice the work in 50 days, working 9 hours a day, will be

If the length (L cm) and breadth (B cm) of a rectangle are increased by 25%, fmd the difference between the areas of the old and new rectangles.