Answer:

Step-by-step explanation:
we have
50%, 2/25, 5, and 0.31
1) 50%
we know that

2) 2/25
Multiply by 4/4

3) 5
Multiply by 100/100

4) 0.31
Multiply by 100/100

Now all numbers have the same denominator
so

therefore


Answer: 12+ 3n - 2 = 40
+2 +2
12 + 3n = 42
-12 -12
3n = 30
(Multiply)3 3
n=10
Step-by-step explanation:
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Its just simple division.
Decimal form:0.86
(hope this helps)