1.

7. Difference between a number and its three-fifth is 40 . Identify the number.a) 80b) 100c) 90d) 120

Answer»

currect answer is 100

let, the number be 'x' 


therefore,

x - 3x/5 = 40

2x/5 = 40 

x = 40×5/2 = 100

therefore, value of x is 100.

so option (b) is correct.



Correct answer is (b)

Let the number be x.

then, it's three-fifth is 3x/5 .

Now,

x-3x/5= 40     (difference given in question)

5x-3x/5 =40

= 2x/5=40

2x= 200

so, x= 100✓




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