<h2>Practice-math-reasoning-puzzle -14</h2>

 Various questions in many patterns

If

345=7

478=20

556=19

642=22

Then

734=?

These questions are given a set of equations related 

to a specific rule so that each equation holds

 You need to find out the pattern used so that the equations are true
 Once you find the pattern that the equations follow, 

then you find the missing number.

 You can see the answer and explanation below

 

 

Answer  The pattern is:If the number is ABC: ABC=AXB-C 345=3X4-5-7 478=4X7-8=20 556=5X5-6=19 642=6X4-2=22 So 734=7x3-4=17 Answer is 17

 

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