Question

The post office has stamps of Rs 1, Rs 3 and Rs 7. Which of the following totals cannot be achieved by
buying exactly 100 stamps?​

Answer 1

Given :  The post office has stamps of Rs 1, Rs 3 and Rs 7.  Few options of total : a)rs 298 b)rs 600 c)rs 473 d)rs 440.

To find :   Which of the following totals cannot be achieved by buying exactly 100 stamps

Solution:

Given options are :

a)rs 298 b)rs 600 c)rs 473 d)rs 440.

Let say Rs 3 Stamps = x

& Rs 7 Stamps = y

Rs 1 Stamps = 100 - (x + y)

Values

= 3x  + 7y + 1(100 - (x + y))

= 2x + 6y  + 100

= 2(x + 3y + 50)

Value will even number

473 is not an even number

Hence  Rs 473 Total can not be achieved by buying exactly 100 stamps

Rs 473 Total can not be achieved by buying exactly 100 stamps

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Answer 2

Step-by-step explanation:

plzz explain step by step