Answer:

Step-by-step explanation:
The inverse operation for an exponential (
) is the logarithm:
.
<span>Equation:
0.15x + 0.10(5-x) = 0.11*5
---
Multiply thru by 100:
15x + 10*5 - 10x = 11*5
---
5x = 5
x = 1 liter (amt. 15% oj needed)
----
5-x = 4 liters (amt of 10% oj needed)
======</span>
Answer:
4
Step-by-step explanation:
12+8 = 20
20/5 = 4
In total there are 5 kids so
5÷3.5=1.4
(rounded)