This is the other homework problem I am stuck on: A homeowner needs 128oz of a solution made up of 3 parts of insecticide A and 5 parts of insecticide B. The solution is then mixed with water.How many ounces of each insecticide should be used?Answer:48 of A,80 of B.Which formula do I follow to get this answer?Thanks!
2006-07-13 14:56:32 · 4 answers · asked by Heather 3 in Science & Mathematics ➔ Mathematics
divide 128 by 8 (total # of parts) to get the # of oz per part. Then multiply that by the # of parts for each insecticide.
2006-07-13 15:02:47 · answer #1 · answered by K S 4 · 0⤊ 0⤋
Since 3 parts are insecticide A, 3x = A
5 parts are insecticide B, 5x = B
Since the whole thing is made up of A and B, 8x = TOTAL = A+B = 128oz. So x = 16 oz. Since 3x = A, A = 48 oz. Since 5x = B, B = 80 oz.
2006-07-13 15:06:31 · answer #2 · answered by vishalarul 2 · 0⤊ 0⤋
First formula (total weight): A + B = 128 oz
Second formula (part sizes are equal): A/3 = B/5
Two equations, two unknowns...solve for one and then will have the other....
A = 3/5 B
3/5 B + B = 128 oz
8/5 B = 128 oz
B = 80 oz
A = 3/5 * 80 oz = 48 oz
2006-07-13 15:32:22 · answer #3 · answered by SkyWayGuy 3 · 0⤊ 0⤋
there are 8 parts to the solution... 3 of A and 5 of B.
128/8 = 16
A is 3/8 of the solution so A is 48
B is 5/8 of the solution so B is 80
2006-07-13 15:05:00 · answer #4 · answered by tex_daddy 1 · 0⤊ 0⤋