Answer:
3.5
Step-by-step explanation:
i think sorry im not sure
Answer:
20 hours
Step-by-step explanation:
To find the answer, you first should find out how long is 25% of the original battery life, 16 hours. To find this, you can divide 16 by 4, or multiply 16 by 0.25. Either works.
16/4=4.
So the new battery lasts 4 hours more than the old battery. Then, add this to the original length to find how long the new battery will last in total.
16+4=20
So first you need to combine like terms:
7b -2/5 = 6b - 7/5
+2/5 +2/5
7b = 6b -5/5
7b = 6b -1
-6b -6b
b=-1
