exam Maths Puzzle Numerical Ability

Three times one number added to five times another number is 54. The second number is two less that the first. Find the numbers.

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exam Other Question

I need help understanding how to simplify expressions using fractions. I am not understanding the first step I need to do. Here is an example problem:

1/2(3a-8)+1/3(2a-9)
Can I have some help with a study guide question?

A large solar hearing panel requires 120 gallons of a fluid that is 30% antifreeze. The fluid comes in either a 50% solution or