West Bengal Board Solutions for Chapter: Time and Work, Exercise 3: Let's Work out - 17.1

Let's make a story of mathematics and find out the relation seeing the above chart.

We can see after $15$ days of digging a canal of $1200$ meter length, $\frac{3}{4}$ part of the canal have been dug. Let's calculate how many days will be needed to dig the rest part.

$3$ tractors can plough $18$ bighas in a day. If $k$ bighas can be ploughed by $7$ tractors in a day the find $k$.

In Kusum's factory $35$ men can cast $10$ ton iron part in a week. The owner has got an order of casting $14$ ton iron parts in a week. Let's find out the proportion and calculate how many new men will be needed.

Let's make the story in mathematical language and find out the relation seeing the above chart.

A pond will be dug in our locality. 24 men need 12 days to cut that pond. Let's find out the proportion and find relation how many men will be needed to dig that pond in 8 days.

$45$ members in a bulb manufacturing co-operative factory can make $10000$ bulbs in $12$ days. Based on a sudden order $10000$ bulb have to be made in $9$ days. Let's calculate how many extra members need to be appointed to supply the bulbs according to the agreement.

$250$ men need $18$ days to dig a pond of $50$ metre length and $35$ metre breadth. Let's calculate how many days will be needed by $300$ men to dig a pond $70$ metre length and $40$ metre breadth of the same depth.