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#30285
Satya
Participant

Challenge Question 8:  21 * ? ? = ? ? 12

Going by the Last by the last digit, we know that that the value of second ? would be 2. So it becomes

2 1

a 2 *

—-

b c 1 2

—-

Going by ‘Vertically and cross wise’ we know that 2*2 + a*1 = c 1

i.e. 4 + a = c 1 –> number that gives 1 in units place of the answer when 4 gets added to it is 7

which makes the above  4 + 7 = 1 1 means a = 7 and there is a carry on of 1 that needs to be added to the hundred’s place value so

2 1

7 2 *

—-

b c(+1) 1 2

—–

7*2 is 14 and there is a carry on of 1 making it 15.  So b is 1 and c is 5.

2 1 * 7 2 = 1 5 1 2

 

  • This reply was modified 7 months, 2 weeks ago by Satya.
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