Compound Variation

$4$ tractors can  plough $20$ acres in $8$ days, find how much acres $30$ tractors will take to plough in $15$ days?

If $24$ people need $10$ kg of dal for $8$ days. Find how many people will finish $50 \mathrm{kg}$ of dal in $15$ days.

A biscuit factory makes $200$ cookies by $8$ men in $5$ day. Find total number of cookies they can prepare by $12$ men in $10$ days?(Apply the formula method for compound variation).

If $20$ person need $40$ kg of rice for $6$ days. Find how much rice is required for $50$ person in $15$ days?(Apply the formula method for compound variation).

$4$ men plough $15$ acres in $9$ days, find how many acres can be ploughed in $20$ days by $30$ men?(Apply the formula method for compound variation).

If $6$ men take $10$ days to type $30$ books, find how many books can be typed by $10$ men in $15$ days?

A farmeer needs $20$ kgs of grains to feed his $10$ pets for $3$ weeks. Find how many food grains is required to cover $15$ pets for $4$ weeks(Apply the formula method for compound variation)

$9$ printers can print $180$ books in $5$ days. How many books it can be printed in $8$ days if we have $4$ printers?

$200$ women working $8$ hours in a day can finish the job in $16$ days. How many women should get engaged to finish the job in $8$ days if they work for $10$ hours a day. ?(Solve by Muliplicative factor method).

A car factory makes $500$ cars in $10$ days with the help of $15$ mechanics. How many cars can be delivered in $12$ days with the help of $25$ machanics?(Solve by Multiplicative factor method).

A farmer has needed $294$ kilos of food to feed $15$ cows for a week. How many kilos of food does the farmer need to feed $10$ cows for $30$ days?

$10$ men can lay a road $75 \mathrm{km}$ long in $5$ days. In how many days can $15$ men lay a road $45 \mathrm{km}$ long?

$6$ printers have printed $100$ books in $4$ days. How many days will it take to print $50$ books if we have $4$ printers?

If $5$ men take $8$ days to type $10$ books, how many days $8$ men will take to type $2$ books?

If $11$ container lorries can transport $165$ tonnes of goods in $5$ days, how many more lorries are required to transport$210$ tonnes of goods in $2$ days?

A farmer needs $30 \mathrm{kgs}$ of food to feed $5$ cows for $2$ weeks. Find how many kilograms of food is required to feed $10$ cows for $5$ weeks? 

$195$ men working $10$ hours a day can finish a job in $20$ days. How many men are employed to finish the job in $15$ days if they work $13$ hours a day?

A soap factory makes $600$ units in $9$ days with the help of $20$ machines. How many units can be made in $12$ days with the help of $18$ machines?

Cotyledons are also called-