problem:


Fred, John and Herbert plucked apples in the ration 3 : 4 : 5 

Herbert plucked 10 apples.

How many apples were plucked together?

 

1. step: given


          parts          apples

Fred:       3               ?

John:      4                ?

Herbert:  5               10                      

total amount: 12       ?

wanted:  total amount apples 
 

2. step: calculate 1 part


1 part = apples Herbert : parts Herbert

1 part =  10 : 5 

1 part = 2 

 

3. step: Fred, John and total amount


          parts             apples

Fred:      3                 3 * 2  =  6

John:      4                4 * 2  =  

Herbert:  5                             10                      

total amount: 12                    24 

 

4. step: answer


They plucked 24 apples altogether.