Which number produces a rational number when multiplied by 1/5

The answer is -2/3

Step-by-step explanation:

A rational number is any number that can be expressed as the quotient or fraction p/q of two integers, a numerator p and a non-zero denominator q.

Remember few things,

a rational number times a rational number=rational number

an irrational number times a rational number=irrational number

The number which produces a rational number when multiplied by 1/5 is -2/3.. It is not an irrational number but a fraction...

0.16 or 16%

step-by-step explanation:

lets take a coin for example.

if you toss it twice, it has a 1/4 chance of landing on heads both times because 1/2 * 1/2 is 1/4.

with the cards, the chance of picking dog is 0.4. having two people pick one is like picking a card twice in a row. so 0.4 * 0.4 is 0.16, or 16%