A 7-gallon mixture contains 45% acid. A 5 gallon mixture contains 30% acid. What percent acid is obtained by putting the two mixtures together, please answer ASAP

4.65 gallons of acid

Step-by-step explanation:

30% of 5 gallons is 1.5 gal

45% of 7 gallons is 3.15 gal

4.65 gal of acid

(5/8)40 + (3/8)50 = 25 + 18.75 = 43.75%

Step-by-step explanation:

This is the answer

b) 1/3 * 1/5

step-by-step explanation:

each smallest part is 1/15 since the written one is 1/5 and it's divided by 3 equal parts. (1/5 )/3 = 1/15 = 1/3 * 1/5