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Basic Math MCQ1 (A number subtracted from a percentage of other number, whats the number?)

MCQ1. 40 is subtracted from 60% of a number, the result is 50. Find the number?

a) 150           b) 110               c) 140        d)  130

Solution:

 

Let the number is ‘x’ – then,

60 percent of the number ​\( = \frac{60}{100}\times x \)

if 40 is subtracted from 60% of the number ‘x’ – then by given condition it is equal to 50

i-e

\[ \frac{60}{100}\times x – 40=50 \]

This gives;

\[ \frac{60}{100}x=50+40=90 \]

\[ x= \frac{100\times90}{60} \]

\[ x= 150 \]

So the number is 150 – so option a is correct!

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