Interstellar
What number could replace * so that */5 is between 3 and 4?
Age
11 to 14
Challenge level
Problem
Which of the following numbers could replace $x$ so that the value of $\frac{x}{5}$ lies between 3 and 4?
$$ 3.2 \qquad \qquad 14 \qquad \qquad 19$$
If you liked this problem, here is an NRICH task which challenges you to use similar mathematical ideas.
Student Solutions
Answer: $19$
$\tfrac x5$ is between $3$ and $4$
$\therefore x$ is between $15$ and $20$
So $x=19$