find the product
2 1/7×2 4/2 ×7/23
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Answer:
so easy
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why don't you use calculator
Problem Solving: If 3+2=7, 5+4=23, 7+6=47 and 9+8=79 to what is 10+9 equal?
Answer
921
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100+ Answers
Asked in 1 Space

Rajesh Atmakuri
, Interested in Management Consulting & Digital Marketing
Updated December 11, 2015 · Upvoted by
Deeksha Bhardwaj
, M.Sc. Mathematics from University of Delhi (2017)
Originally Answered: If 3+2=7, 5+4=23, 7+6=47 and 9+8=79 to what is 10+9 equal?
Going through the different answers given below, there are so many logics but too deep.
I have another logic, which is somewhat simple what i thought, and feel its feasible.
if 3+2=7 then one of the ways it could have come to this conclusion is, (3*2)+1=7. Though it shows the symbol as addition, as it is a comparitive puzzle i am taking in this way. Now it follows like this.
3+2=7 means (3*2)+1=7
5+4=23 means (5*4)+3=23
7+6=47 means (7*6)+5=47
9+8=79 means (9*8)+7=79
Now comes the tricky part. If you can see after multiplying the digits, which were given supposedly for addition, and adding 1,3,5,7 subsequently to each of them the resultant of them was 7,23,47,79.
Now, though it may seem like they are adding sequential odd numbers, ut they can be prime numbers too.
If they are odd numbers the next number in the sequence to be added would be 9, so that the answer would become 10+9=99 like (10*9)+9=99 concept.
Edited: I'm excluding this part down here in {} as '1' is neither prime nor composite. Thanks to Mr.Tanmay Mishra for reminding me the about the basic concept that I've overlooked. Good presence of mind, appreciate it.
{If they are prime numbers then the next number in the sequence to be added would be 11, so that the answer would become 10+9=101 like (10*9)+11=101.}
So finally, to the given puzzle according to the logic explained answer is 99
Anybody can correct if i am wrong and can show if a logic is more feasible than this.
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Nalini Bhardwaj
Answered February 23, 2016
Originally Answered: If 3+2=7, 5+4=23, 7+6=47 and 9+8=79 to what is 10+9 equal?
Logical reasoning
This is simple calculation based on logical thinking. Multiply each number then add with odd number. Every next sum is solved in same fashion only the next odd numbers are to be selected for next sum.
3+2=7,
3*2=6+1= 7
5+4=23,
5*4=20+3= 23
7+6=47
7*6=42+5= 47
9+8=79
9*8=72+7=79
what is 10+9 equal?
Going in same order
10*9=90
Adding next odd number I.e 11
90+11= 101
Answer is 101