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The cost of a workbook is 7 less than on...

The cost of a workbook is `7` less than one-third the price of the reference book. Find the rule for finding the:
a. price of the workbook if the reference book costs `"Rs. x"`.
b. price of the reference book if the workbook costs `"Rs. y"`.

A

`"a. Rs."` `2/3x` `-7`
`"b. 3y+9 "`

B

`"a. Rs."` `(x-21)/3`
`"b. 3y+7 "`

C

`"a. Rs."` `1/5x` `-7`
`"b. 5y+7 "`

D

`"a. Rs."` `1/3y` `-7`
`"b. 3x+7 "`

Text Solution

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The correct Answer is:
B
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