Propane also known as LP gas, is often mixed with about _______ percent of other gases, such as butane, propylene, and mercaptan.

A. 5
B. 10
C. 20
D. 30

Java - Using a method, how do I "write a program whose input is a character and a string, and whose output indicates the number of times the character appears in the string. Your program must define and call the following method that returns the number of times the input character appears in the input string.

public static int countCharacters(char userChar, String userString)"

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Propane also known as LP gas, is often mixed with about _______ percent of other gases, such as butane, propylene, and mercaptan. A. 5 B. 10 C. 20 D. 30

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Propane also known as LP gas, is often mixed with about _______ percent of other gases, such as butane, propylene, and mercaptan.

A. 5
B. 10
C. 20
D. 30