Jenny Johnston bought some apples for 79 cents per pound and twice as many pounds of bananas for 39 cents per pound. If her total bill was $7.85, how many pounds of bananas did she buy?
2006-06-29 21:10:35 · 8 answers · asked by LaToya J 1 in Science & Mathematics ➔ Mathematics
6.5 pounds.
2006-06-29 21:16:14 · answer #1 · answered by Anonymous · 0⤊ 0⤋
She bought 10 pounds of bananas and 5 pounds of apples.
.79 x 5 = $3.95
.39 x 10 = $3.90
total = $7.85
2006-06-29 21:18:27 · answer #2 · answered by sharrron 5 · 0⤊ 0⤋
let the number of apples x and the cost = 79 cents
so the number of banana = 2x cost = 39
so the total he pay 7.85
then
x*rate of apples + 2x*rate of banana = 7.85 total rate
x0.79x + 2x(0.39) = 7.85
.79x + .78x = 7.85
1.57x = 7.85
x = 5
so the number of apple be 5 and bananas are twice of apple the it 10 ans
2006-06-29 22:12:53 · answer #3 · answered by Anonymous · 0⤊ 0⤋
She bought 10 lbs of bananas.
39 cents doubles is 78 cents
soooo. just cut you total cost in half and then divide by 39 cents.
2006-06-29 21:18:54 · answer #4 · answered by devilishgrl14 2 · 0⤊ 0⤋
"A"- No,of pounds of apple.; "2A"- No.of pounds of banana.
Ax79 + 2Ax39 = 785......A=5.
Hence No of pounds of banana = 2A = 10.
2006-06-29 22:10:49 · answer #5 · answered by Ratz 2 · 0⤊ 0⤋
.79x + 2(.39x) = 7.85
.79x + .78x = 7.85
1.57x = 7.85
x = 5
5 lbs of apples, 10lbs of bananas
2006-06-29 21:17:47 · answer #6 · answered by Brandon M 1 · 0⤊ 0⤋
now iam hungry and wish i had a apple pie or a bannana split
2006-06-29 21:14:33 · answer #7 · answered by polkahaunis 3 · 0⤊ 0⤋
...and how many of them did she really eat??
:-o)
2006-06-29 21:50:53 · answer #8 · answered by Anonymous · 0⤊ 0⤋