Question 1126323: Ann, Bill, Cara, and Denis weighed in pairs. Ann and Bill weigh 180 pounds altogether. Bill and Cara weigh 190 pounds altogether, and Cara and Denis weigh 210 pounds altogether. How much do Ann and Denis weigh altogether?
Answer by ankor@dixie-net.com(22740)   (Show Source):
You can put this solution on YOUR website! Ann, Bill, Cara, and Denis weighed in pairs.
Ann and Bill weigh 180 pounds altogether.
a + b = 180
Bill and Cara weigh 190 pounds altogether
b + c = 190
and Cara and Denis weigh 210 pounds altogether.
c + d = 210
How much do Ann and Denis weigh altogether?
:
find their total weight.
a + b + c + d = ___
Replace a+b with 180, replace c+d with 210
180 + 210 = 390 is the total weight
Subtract b + c which is 190
390 - 190 = 200 is the weight of a + d (Ann & Denis)
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