Question

Cost of 25 pens of some kind is Rs.225. How many such pens can be bought for Rs.810.

Answer 1

Answer:

90 pens

Step-by-step explanation:

Cost of 25 pens= Rs 225

∴ Cost of 1 pen= $\frac{225}{25}$

                        = Rs 9

Now pens that can be bought for Rs 810 = $\frac{810}{9}$

                                                                    = 90 pens

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Answer 2

Answer:

90

Step-by-step explanation:

First of all we have to write down our formula

that is 25 = 225

           $x$  = 810

x represents the number of pens that can be bought for Rs.810

The next thing u do is to cross multiply.

After cross multiplying it should be like this:

25 x 810 = 225$x$

Next you divide both sides by the number with a variable that is 225

so it will be 25 x 810 = 225$x$

                     225         225

so 25 will go into 225, 9 times and 810 divided by 9 is 90

and as we all know any number divided by itself is 1 so 225 will go into 225 once which will make  the $x$  stand alone.

∴ $x$ = 90 pens