Question

5 packs of pens containing 10 in each cost Rs 250.What is the cost of 21 pens?​

Answer 1

Answer:

105/-

Step-by-step explanation:

No. of pens in each pack=10

No. of packs=5

Cost of 5 packs=250/-

Cost of 1 pack=250/5=50/-

No. of pens in 2 packs =20

Cost of 2 packs =100/-

cost of 1 pen =50/10=5

cost of 21 pens =100+5=105/-

Answer 2

Answer:

first we should know the total number of pens

then we should find cost of one pen and then multiply it by 21 to get cost of 21 pens.

5 packets =10 pens in each packet

total pens=10×5

=50 pens are there in total

and cost of 50 pens is 250

so to know cost of one pen ,

we should divide 250/50

=5

therefore,cost of one pen=5 rupees

cost of 21 pens=5×21

=105

therefore cost of 21 pens is 105 rupees.

Step-by-step explanation:

hope it is correct and helps you.

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