Question

The marks in a test decreased from 40 to 30 . The percentage of decrease is ______

Answer 1

Step-by-step explanation:

Decrease = 40 - 30 = 10

Orignal number = 40

So,

$percentage = \frac{decrease}{original} \times 100$

So,

$percentage = \frac{10}{40} \times 100 \\ \: = \frac{1}{4} \times 100 \\ = 25\%$

This is the correct answer

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Answer 2

Answer:

plz mark me as brainliest

Step-by-step explanation:

Bro once can you tell the total marks of exam

i will give a suggestion see here

30/total marks of your exam × 100