Question

each week-day a newspaper boy delivered 315 newspapers.How many newspapers did he deliver in January​

Answer 1

Answer:

8,820

Step-by-step explanation:

no. of newspaper delivered daily = 315

no. of day is the month of February (non-leap year)=28

no. of newspapers delivered in month of February=315 ×28 =8,820

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Answer 2

Answer:

He delivered total 9765 newspaper in January.

Step-by-step explanation:

Given,each week-day a newspaper boy delivered 315.

So,he delivered total number of newspaper in one day $= 315$

Now we want to find How many newspapers did he deliver in January?

We know number of week-days in January month $= 31$

So, in 1 day,the boy delivered 315 newspaper.

By Unitary method in 31 day,the boy delivered $(315 \times 31) = 9765 \: newspapers$

This is a problem of Algebra.

Some important formulas of Algebra,

${(x + y)}^{2} = {x}^{2} + 2xy + {y}^{2} \\ {(x - y)}^{2} = {x}^{2} - 2xy + {y}^{2} \\ {(x + y)}^{3} = {x}^{3} + 3 {x}^{2} y + 3x {y}^{2} + {y}^{3} \\ {(x - y)}^{3} = {x}^{3} - 3 {x}^{2} y + 3x {y}^{2} - {y}^{3} \\ {x}^{3} + {y}^{3} = {(x + y)}^{3} - 3xy(x + y) \\ {x}^{3} - {y}^{3} = {(x - y)}^{3} + 3xy(x - y) \\ {x}^{2} - {y}^{2} = (x + y)(x - y) \\ {x}^{2} + {y}^{2} = {(x - y)}^{2} + 2xy \\ {x}^{2} - {y}^{2} = {(x + y)}^{2} - 2xy \\ {x}^{3} - {y}^{3} = (x - y)( {x}^{2} + xy + {y}^{2} ) \\ {x}^{3} + {y}^{3} = (x - + y)( {x}^{2} - xy + {y}^{2} )$

Know more about Algebra,

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