Third unknown number

The number A is 5 more than the number C and 10 less than the number B. The sum of A+B=100. What is the C number?

Correct answer:

C =  40

Step-by-step explanation:

A=5+C A = B10 A+B=100  A+B=100 A+(A+10)=100 2A+10=100 A=90/2=45  C=A5=455=40   Verifying Solution:  B=A+10=45+10=55 s=A+B=45+55=100



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