Aptitude - Numbers - Discussion

Discussion :: Numbers - General Questions (Q.No.7)

7. 

(935421 x 625) = ?

[A]. 575648125
[B]. 584638125
[C]. 584649125
[D]. 585628125

Answer: Option B

Explanation:

935421 x 625 = 935421 x 54 = 935421 x 10 4
2

= 935421 x 104 = 9354210000
24 16

= 584638125


Priyanka said: (May 26, 2011)  
From where did (10/2)^4 came?

Gokul said: (May 29, 2011)  
We simply write (5) as 10/2...... (10/2=5)

Mahesh Babu said: (Jun 25, 2011)  
Is there any short cut for this. If there please let me know.

Albret said: (Apr 20, 2012)  
625=5^4 MEANS 5*5*5*5= 5^4

Meenu said: (Jun 21, 2012)  
935421* (600+20+5).

935421*600=561252600.

935421*20=18708420.

935421*5=4677105.

(561252600+18708420+4677105) =584638125 answer.

Nazish Amam said: (Oct 14, 2012)  
(900000+30000+5000+400+20+1)*625
=562500000+18750000+3125000+250000+12500+625
=584638125

Dr R Vasudevan said: (Jan 24, 2013)  
625 - use familiar 6.25 %, which is 100/16 ( like 12.5 = 100/8)(3.125% = 100/32).

Rest is as given in the top "EXPLANATION" 935421*10000/16 = 584638125.

Malay Biitm Bbsr said: (Mar 30, 2013)  
1st step: 935421*100 = 93542100.

2nd step: 93542100*6 = 5161252600.

3rd step: 93542100/4 = 23385525.

4th step: 561252600 + 23385525 = 584638125(Answer).

Banasree said: (Jul 17, 2013)  
@Malay.

Why the no is divide by 4 in 3rd step? explain.

Cusat ,Nitish said: (Aug 19, 2013)  
935421* (600+20+5).

935421*600 = 561252600.

935421*20 = 18708420.

935421*5 = 4677105.

(561252600+18708420+4677105) = 584638125.

R.V said: (Dec 21, 2014)  
93542100*6.
935421*20.
935421*5.

We take multiply of 20 and 5 is 20/5 = 4.

"93542100/4".

Vignesh said: (Feb 2, 2015)  
935421* (600+20+5).

935421*6 = 5612526 add two 0 in end 561252600. -----A.

935421*2 = 1870842 add one 0 in end 18708420. ------B.

935421*5 = 4677105. -----C.

A+B+C = 584638125.

Prema said: (Jun 12, 2015)  
Simply you will multiply 935421 with 625.

Nitesh Vatsa said: (Aug 22, 2015)  
Lucky digit method.

Cancel multiple of 9 and add the rest.

3+2+1 = 6.
6+2+5 = 13 = 1+3 = 4.
6*4 = 24, 2+4 = 6.

Now check lucky digit method for option.

1. Cancel all combination of nine.

Add the rest 5+8 = 13 = 1+3 = 4.

So correct answer is B.

Mili said: (Jun 29, 2016)  
How 2 power 4 comes in denominator?

Priyank said: (Jul 30, 2016)  
@Nitesh Vatsa.

Options B and D both have sum = 6.

Then which is the correct answer?

Raju said: (Sep 1, 2016)  
By logic.

9 + 3 + 5 + 4 + 2 + 1 * 6 + 2 + 5 = 24 + 13,
==> 2 + 4 * 1 + 3 = 6 x 4,
==> 24 = 2 + 4 = 6.

1. 5 + 7 + 5 + 6 + 4 + 8 + 1 + 2 + 5 = 43 => 4 + 3 = 7.
2. 5 + 8 + 4 + 6 + 3 + 8 + 1 + 2 + 5 = 42 => 4 + 2 = 6.

So, option 2 satisfy with the given expression.

Therefore, option 2 is the answer.

Sidharthan M said: (Apr 10, 2018)  
Please help me to solve this problem.

The sum and product of two numbers are 13 and 40 respectively. The sum of their reciprocal is?

Chinmayi said: (Jul 14, 2018)  
@Raju.

Option 4 also satisfy with given expression.
5+8+5+6+2+8+1+2+5 => 4+2 => 6.
Then how to choose the correct answer?

Udaya Shankar S said: (Sep 26, 2018)  
How 10/2 comes will you please explain?

Lasya said: (Oct 5, 2018)  
Is 935421 alone divisible by 16?

If yes how is it possible? Please explain.

Anshika Ydv said: (Oct 16, 2018)  
I didn't understand the answer of this question. Could you explain it, please?

Anjana Sathyan said: (Mar 20, 2019)  
How to solve this 9354210000/16? Please explain in clear.

Girish said: (Apr 15, 2019)  
If the thousands digit is even, examine the number formed by the last three digits must be divisible by 16.

i.e 254,176: 176.

If the thousands digit is odd, the number formed by the last three digits plus 8 must be divisible by 16.

i.e 3408: 408 + 8 = 416.

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