Number, NAPX-I3-NC31 SA

Question

Daisy is in high school and her age this year is both a prime number and a factor of 51.

In two years' time, Daisy's age will again be a prime number.

What is Daisy's age this year?

Worked Solution

Consider the factors of 51:

3 × 17 = 51


3 is too young for high school, but 17 is not.

In two years' time:

17 + 2 = 19 (prime)


∴\therefore Daisy is {{{correctAnswer0}}} this year.

Variant 0

DifficultyLevel

723

Question

Daisy is in high school and her age this year is both a prime number and a factor of 51.

In two years' time, Daisy's age will again be a prime number.

What is Daisy's age this year?

Worked Solution

Consider the factors of 51:

3 × 17 = 51


3 is too young for high school, but 17 is not.

In two years' time:

17 + 2 = 19 (prime)


∴\therefore Daisy is 17 this year.

Question Type

Answer Box

Variables

Variable nameVariable value
correctAnswer0
17
prefix0
suffix0

Answers

Specify one or more 'ANSWER' block(s) as exampled below.
Note: correctAnswer is required, the rest are optional. ("correctAnswer" is what the student would need to type in to the box to get the answer correct.)

For example:
correctAnswer: 123.40

And optionally, specify the following, but only if you need something different to the defaults: 'width' defaults to 5 if not present, and valid values are 3 to 10; 'prefix' and 'suffix' default to nothing if not present.
prefix: $
suffix: mm$^2$
width: 5

correctAnswerNcorrectAnswerValueAnswer
correctAnswer017

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