exam Maths Puzzle Numerical Ability

i have a problem with an equation.
8a+4a=144 i don't understand how to solve this equation

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How many gallons each of 25% alcohol and 35% alcohol should be mixed to obtain 20 gallons of 32% alcohol? bernice purchased 15 bonds from her broker for 1025 each. These bonds each pay semiannual interest of 42.50. Over the next one and a half years, the price of the bonds decline to 9