Collection of stamps

Jano, Rado, and Fero have created a collection of stamps in a ratio of 5: 6: 9. Two of them had 429 stamps together. How many stamps did their shared collection have?

Correct result:

n =  780


n1=429/(5+6)=39 n2=429/(5+9)=4291430.6429 n3=429/(6+9)=1435=28.6  n1N  j=5 n1=5 39=195 r=6 n1=6 39=234 f=9 n1=9 39=351  n=j+r+f=195+234+351=780

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