Question

If x is 20% less than y, find:

1) x/y​

Answer 1

Step-by-step explanation:

let y be 100

100x20%100=20

100-20=80

80%100=0.8

Answer 2

Answer:

As x is 20% less than y,

20% of y is,

=y\times \dfrac{20}{100}

So x is

x=y-(y\times \dfrac{20}{100})

=y(1-\dfrac{20}{100})

=y(1-0.2)

=0.8y

Then,

\dfrac{y-x}{y}=\dfrac{y-0.8y}{y}=\dfrac{y(1-0.8)}{y}=1-0.8=0.2

Therefore, the value of \dfrac{y-x}{y} is 0.2

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