Aptitude - Decimal Fraction - Discussion

@All.

If both the numbers are in same form then do the simple calculation.

3.87 - 2.59 = 1.28.

@Vasu.

You reached till 127/99, Which is perfectly right, now to solve this further look at the options a) 1.20 and b) 1.2bar is no ways the answer.

Let's take c) 1.27bar .. solve this 1.27 bar can be written as 1+0.27 bar which is nothing but 1+27/99 now solve this you get 126/99 which is not what you got.

Now take option d) 1.28bar same as above this can be written as 1+0.28 bar which is 1+28/99 and solve this now, You get the Solution as 127/99 same as what you got. Hence option d)1.28bar is the right answer.

Hope it helped you.

3.87-2.59.
(3+87÷99)-(2+59÷99),
(297+87)÷99 -(198+59)÷99,
(384÷99)-(257÷99),
127÷99.

I don't know where I am wrong, can anyone explain?

I think the correct answer is 1.27bar.

Simple method.

3.87bar=3.878787 (bar numbers is repeated).
2.59bar=2.595959(bar number repeated) now subtract=1.282828(28 is repeated so put bar on that number so the answer is 1.28bar.

Why it is not like (387-3)/99 -(259-2)/99?

Then, 127/99,
Ans = 1.(bar of 27) or 1.27.

Why the all number divided by 99? Just tell.

Thanks for solving it.

Thanks for the explanation.

Good solution and even short cut way is also so good.