Question

if 6+4==210 ,then ?+?=123 how

Answer 1

For example;

a + b = (a – b),(a + b)

so if we test in the first equation it is;

6 + 4 = (6 – 4),(6 + 4) = 210

So let the missing numbers in the last equation be c & d;

c + d = 123

Therefore we can write;

c – d = 1

c + d = 23

Solving these 2 equations we get;

2c = 24;

Therefore C = 12

and d = 11

Answer: 12 + 11 = 123

Answer 2

if 6+4 = 210 ,then 12+11=123 ,
here, 6+4=10& 6--4=2 so 210,
thus ,12+11=23& 12--11=1 so 123 it is right