Question

9+5=9 , 7+5=5 , 12+6=15 , 18+11=?

Answer 1

Answer:

9+4=5,7-2=5,12+3=15,18+11= 33

Step-by-step explanation:

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Answer 2

Given:

9+5=9 , 7+5=5 , 12+6=15 , 18+11=?

Solution:

Find the pattern for $\[9 + 5 = 9\]$

$\[\begin{array}{l} = \left( {9 - 5} \right) + \left( {9 + 5} \right)\\ = \left( {4 + 14} \right)\\ = \left( {4 + 1 + 4} \right)\\ = 9\end{array}\]$

Find the pattern for $\[7 + 5 = 5\]$

$\[\begin{array}{l} = \left( {7 - 5} \right) + \left( {7 + 5} \right)\\ = \left( {2 + 12} \right)\\ = \left( {2 + 1 + 2} \right)\\ = 5\end{array}\]$

Find the pattern for $\[12 + 6 = 15\]$,

$\[\begin{array}{l} = \left( {12 - 6} \right) + \left( {12 + 6} \right)\\ = \left( {6 + 18} \right)\\ = \left( {6 + 1 + 8} \right)\\ = 15\end{array}\]$

Evaluate $\[18 + 11 = ?\]$

$\[\begin{array}{l} = \left( {18 - 11} \right) + \left( {18 + 11} \right)\\ = \left( {7 + 29} \right)\\ = \left( {7 + 2 + 9} \right)\\ = 18\end{array}\]$

Hence, $\[18 + 11 = 18\]$