A factory requires 42 machines to produce a given number of articles in 63 days. How many machines would be required to produce the same number of articles in 54 days?

How many grams of ammonium chloride would be required to produce 10 litres of NH_3 at STP.

How many moles methanes are required to produce 88g CO_2 (g) after combustion?

A cottage industry produces a certain number of pottery articles in a day.It was observed on a particular day that the cost of production of each articles (in rupees)was 3 more than twice the number of articles produced on that day.If the total cost of production on that day was Rs.90,find the number of articles produced and the cost of each articles.

How many mole of methane are required to produce 22g CO_2(g) after combustion?

Work Problem on Time and Work A and B can do a piece of work in sixteen days. After working four days together A being retire from the work and B finished the work alone in thirty-six days. Find how many days required by each to complete the work.

The cost and revenue functions of a product and givenm by C(x)=2x+400 and R(x)=6x+20 respectively,where x is the number of items produced by the manufacturer.How many items the manufacturer must sell to realise some profit?

Work Problem on Time and Work A and B working together can complete a work in eight days. After working for five days together, A has left away and B completed the work in nine days working alone. Find the number of day required by each of them to complete the work alone.

In a primary school parents were asked about of the number of hours they spend per day in helping their children to do home work. There were 90 parents who helped for frac(1)(2) hour to 1frac(1)(2) hours. The distribution of parents according to the time for which, they said they helped is given in the adjoining figure, 20% helped for more than 1frac(1)(2) hours per day, 30% helped for frac(1)(2) hour to 1 hours, 50% did not help at all. Using this, answer the following : How many said that they didnot help?

In a primary school parents asked about of the number of hours they spend per day in helping their children to do home work. There were 90 parents who helped for frac(1)(2) hour to 1frac(1)(2) hours. The distribution of parents according to the time for which, they said they helped is given in the adjoining figure, 20% helped for the than 1frac(1)(2) hours per day, 30% helped for frac(1)(2) hour to 1 hours, 50% did not help at all. Using this, answer the following : How many said that they helped more than 1frac(1)(2) hours?