Question

You are building a new extension and are looking at the plans.referring to the scale, what is the actual measurement of the wall marked 18 cm on the plan?m

Answer 1

we have that

The scale is equal to $\frac{1}{50}$

That means

$1\ cm\ in \ the \ plan=50\ cm\ in \ the \ actual$

so

by proportion

Find the actual measurement of the wall marked $18$cm on the plan

$\frac{1}{50}\frac{plan}{actual}=\frac{18}{x}\frac{plan}{actual}\\ \\x=18*50\\ \\x=900\ cm$

Convert to meters

$900\ cm=900/100=9\ m$

therefore

the answer is

$9\ m$

Answer 2

1:50 scale  means     1cm  on paper and  50cm in real life . So 18x50=900cm
and the answer is 9m . Hope you enjoy !