Answer:
a + 20 = 7*12 (multiplied both sides by 12)
a + 20 = 84 (calculated 7*12)
a = 84 - 20 (subtracted 20 on both sides)
a = 64 (calculated 84-20)
<span>√(5*8*24) or anything along those lines, you can switch the numbers around , it wont matter</span>
80 Liters
(hope this helps)
