exam Maths Puzzle Numerical Ability

I need help solving this problem. Please help.
You need a 21% salt solution to fill your fish tank. How much of the 15% salt solution should be added to 12 gallons of the 25% salt solution to create the desired salt solution?

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exam Other Question

par for the course sports math states the questions should be set up algebraically. one player scored on each hole of a golf course.
1. the player scored par on hole #3
2. he sc Write the equation of the line with slope -5 and y-intercept (0, 5).

A) y = 5x - 5 B) 5x - 5y = 0 C) y = -5x + 5 D) -5y = 5