Question

1 + 2 = 21 2 + 3 =36 3 + 4 = 43 4 + 5 =?​
And it is not 54

Answer 1

4 + 5 = 58  if 1 + 2 = 21 2 + 3 =36 3 + 4 = 43

Step-by-step explanation:

One solution

1 + 2  = 12 + 9  =    21

2  + 3  = 23  + 13 = 36

3 + 4 = 34  + 9  =   43

4 + 5 = 45  +  13  = 58

a + b  = ab  + 9  / 13 alternatively

Another way

1 + 2 =  21  + 0   = 21

2 + 3 = 32  + 4  = 36

3 + 4  = 43  + 0  = 43

4 + 5  = 54  + 4  = 58

a + b  = ba  + 0 /4 alternatively

Learn More

Missing number 3, 10, 35, _, 217, 428​

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Answer 2

58is the answer.

Given,

1 + 2 =21.

2 + 3 = 36.

3 + 4 = 43.

4 + 5 = ?

To Find,

The value of 4 + 5.

Solution,

Given that,

the value of 1+2 is 21, 2 + 3 is 36, 3+4 is 43.

And need to find out the value of 4 + 5.

Here the given result is much larger than the operands. So multiplication operation also there.

1 + 2 = 21 ⇒ 1 + 2 × 10 = 21.

3 + 4 = 43 ⇒ 3 + 4 × 10 = 43

2 + 3 = 36 ⇒ ( 3 × 10 + 2) + 4 = 36.

4 + 5 = ( 5 × 10 + 4) + 4 = 58.

Hence, the value of 4 + 5 is 58.

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