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Question

Jack’s age is 0.27 times the age of his father. His father’s present age is 45 years. Jack’s present age correct to one decimal place will be



A

12

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B

12.1

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C

12.2

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D

12.3

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Solution

The correct option is C

12.2


Jack’s present age= 0.27 × His father’s present age

                                = 0.27 × 45

                                = 12.15 years

Since there is 5 at the second decimal place, the first decimal place will be rounded off to next number (because if a digit is 5 or greater than 5, then its preceding digit can be rounded off to the next integer) i.e. 1 will be rounded off to 2.

Thus, 12.15 can be rounded off to 12.2.


Mathematics

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