SOLUTION: And orange has 20 fewer calories than a banana. It's seven bananas have the same number of calories as nine oranges how many calories banana

Question 909226: And orange has 20 fewer calories than a banana. It's seven bananas have the same number of calories as nine oranges how many calories banana
Answer by JulietG(1812) (Show Source): You can put this solution on YOUR website!
R = B-20
7B = 9R
Substitute the value of the orange (R) from the first equation into the second.
7B = 9(B-20)
7B = 9B-180
Add 180 to each side
180 + 7B = 9B
Subtract 7B from each side
180 = 2B
Divide each side by 2
B = 90
If a banana has 90 calories, then the orange has 70 calories
7(90) = 9(70)
630 = 630
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