Problem Solving (PS) | Re: If C + D = 11 and C and D are positive integers, which of

C+D=11
what is 5C+8D
Lets us find pairs in which C and D add up to 11
If C=10,9,8,7,6,5,4,3,2,1
Than D=1,2,3,4,5,6,7,8,9,10
plug in value of C and as per the above pair only

If C=10 than D=1
5X10+8X1=55+8=63 not correct as none of the answer choice has 63 as an option
Next pair
C=9 and D=2
5X9+8X2=45+16=61= answer B

---