Aptitude - Numbers - Discussion
Discussion Forum : Numbers - General Questions (Q.No. 44)
44.
-84 x 29 + 365 = ?
Answer: Option
Explanation:
| Given Exp. | = -84 x (30 - 1) + 365 |
| = -(84 x 30) + 84 + 365 | |
| = -2520 + 449 | |
| = -2071 |
Discussion:
11 comments Page 1 of 2.
Auyig said:
4 years ago
First find the digital sum :
=> -(8+4)*(2+9)+(3+6+5)
=> - (12)*(11) +(14)
=> -(3)*2+5
=> -6+5
=> -1.
Now, if the answer comes in negative in any case then subtract the numeral value of the answer from 9.
In this case => 9-1 = 8.
so the overall digital sum is 8.
the answer will be -2071 because:
-(2+0+7+1).
=-(10).
=-1 => this answer also negative so subtract it from 9.
9-1 = 8.
This digital sum is the same as the digital sum derived from the problem.
=> -(8+4)*(2+9)+(3+6+5)
=> - (12)*(11) +(14)
=> -(3)*2+5
=> -6+5
=> -1.
Now, if the answer comes in negative in any case then subtract the numeral value of the answer from 9.
In this case => 9-1 = 8.
so the overall digital sum is 8.
the answer will be -2071 because:
-(2+0+7+1).
=-(10).
=-1 => this answer also negative so subtract it from 9.
9-1 = 8.
This digital sum is the same as the digital sum derived from the problem.
(2)
Monesha said:
4 years ago
Try using bodmas rule;
Which is in the order bracket order division multiplication addition subtraction
which follows---->. -(84*29)+365.
= -2436 + 365,
= -2071.
answer .D
Which is in the order bracket order division multiplication addition subtraction
which follows---->. -(84*29)+365.
= -2436 + 365,
= -2071.
answer .D
(1)
Prakhar chauhan said:
7 years ago
Option C is wrong because;
-(84 * 29) = - 2436.
And,
-2436+365 can be written as =365- 2436.
Now,
365-2436= - 2071.
So option D is right.
-(84 * 29) = - 2436.
And,
-2436+365 can be written as =365- 2436.
Now,
365-2436= - 2071.
So option D is right.
(1)
Priyanka said:
5 years ago
@Vikas
If unit digit is zero then it is easy to multiple so it was written as 30-1.
If unit digit is zero then it is easy to multiple so it was written as 30-1.
Gagandeep Singh said:
10 years ago
= -(84x30) = -2520.
= -2520+84 = -2436.
= -2436+365 = -2071.
= -2520+84 = -2436.
= -2436+365 = -2071.
(1)
Judith said:
7 years ago
Why not C, How come 30 from -84 x (30 - 1) + 365?
Vikas said:
6 years ago
Can someone tell me why we need to do (30-1)?
Jas said:
7 years ago
Why not the option C? please explain.
.
.
Yogi said:
8 years ago
Why not the option C? please explain.
Prashant said:
7 years ago
Why not the option A? Please explain.
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