Question

13. The length of a rope is decreased by 12%. What is the new length if it was 150 metres?
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Answer 1

Answer:

Length of rope was 150 m

12% decrease = 12/100x150

= 18 m

Therefore new length = 150 - 18

= 132 m

Answer 2

Given:-

a rope has length of 150 metres

To find:-

if the length decreased 12% then the new length.

Solution:-

Let's understand the concept:-

Here the length is decreased by 12%of the older length so we need to find the 12%of older length first then substract it from the older length.

12%of older length:-

${:}\longrightarrow$12% of 150

$=12%×150$

$={\cancel{150}}×{\frac{12}{{\cancel{100}}}}$

$=3×{\frac{{\cancel{12}}}{{\bcancel{2}}}}$

$=3×6$

$=18$

New length of rope:-

${:}\longrightarrow$150-18

${\underline{\boxed{\bf{=132}}}}$