algebra

posted by .

an orange has 20 fewer calories than a banana. If 7 bananas have the same number of calories as 9 oranges, how many calories are in a banana?

• algebra -

Let X be the number of calories in a banana, and Y be the number in an orange.
7X = 9Y
7X - 9Y = 0
X - Y = 20
9X - 9Y = 180
2X = 180
X = 90
Y = X -20 = 70

Similar Questions

Find the number of Calories in a grapefruit and an orange. (1) An orange has 15 more Calories than a grapefruit. (2) Twenty oranges and ten grapefruit have 1800 Calories.

An apple has 24 fewer calories than a banana. If 7 bananas have the same number of calories as 10 bananas, how many calories in one banana?

An apple has 24 fewer calories than a banana. If 7 bananas have the same number of calories as 10 apples, how many calories are in a banana?
4. Math (Algebra)

An apple has 24 fewer calories than a banana. If 7 bananas have the same number of calories as 10 apples, how many calories are in the banana?
5. Hea;th

Empty calories are defined as ________. A. Calories from dairy products only B. Calories from low-fat foods and/or fruits and vegetables C. Calories from water and other foods or beverages that have zero calories D. Calories from solid …
6. math

At Thanksgiving dinner, Deborah ate a portion of turkey (673 calories;masch potatoes (408 calories);stuffing (519 calories); cranberry sauce (219 calories);beans (278 calories); and pumpkin pie (523 calories); approximately how many …
7. Health

Empty calories are defined as ________. A. Calories from dairy products only B. Calories from low-fat foods and/or fruits and vegetables C. Calories from water and other foods or beverages that have zero calories D. Calories from solid …
8. Algebra

1. The cost in dollars of an "n" mile trip with the Supreme Taxi Service is given by 1.5 + 1.75n. The cost of an "n" mile trip using Twon Taxi Service is given by 1.9 + 1.6n. For rides between 1 and 10 miles, which service would you …
9. math

the cost of banana is Re.1 more than that of an orange. Mr asad purchased 12 bananas and 20 oranges . if he paid Rs.108 to the fruit saller, find the price of a banana and orange.
10. Math

1. Five medium apples have about 475 calories. Three medium oranges have about 186 calories. Apple:_____________ Orange:____________ ______________ have fewer calories. How do you do this?

More Similar Questions