Question

6+4=210
?+?=123
what is the answer?

Answer 1

0 + 23 = 123....................

Answer 2

Given,

6 + 4 = 210

We know that ,

6 + 4 = 10 and 6 - 4 =2.

So we got that number is formed by first the difference of those numbers and then by their sum.

Now,

? + ? = 123

So we have to find such numbers whose sum is 23 and difference is 1.

Let one number is x and another is y.

So,
x + y = 23. ------ ( 1 )

x - y = 1. ----- ( 2 )

By adding both equations,

x + y + x - y = 23 + 1

2x = 24

x = 24 ÷ 2

x = 12.

By putting the value of x in ( 1 ) ,

12 + y = 23

y = 23 - 12

y = 11.

? + ? = 123

12 + 11 = 123.