Question

School guidelines require that there must be at least 2 chaperones for every 25 students going on a school trip. How many chaperones must there be for 53 students?
2 chaperones
27 chaperones
4 chaperones
5 chaperones

Answer 1

There must be at least 5 Chaperones

Answer 2

We can use ratio and proportion to find the number of chaperones

Let $x$ represent the number of chaperones.

Number of Students                                    Number of Chaperones

25                                                                                   2

53                                                                                $x$

If 25 corresponds to 2, then 53 will correspond to a value more than 2. If more, less divides, hence

$x=\frac{2 \times53}{25}$

$x=\frac{106}{25}$

$x=4.24$

Since humans are whole entities, we round up to the nearest whole number which is 5.

The point is that we are dealing with humans and 4.24 means 4 chaperones plus 0.24 chaperone. since we cannot add 0.24 of the next chaperone to the 4, we add one full chaperone.

So there are at least 5 chaperones