book Maths Puzzle Numerical Ability

Hassan invested $7000 for one year.He invested part of it in high risk fund thats pay 15% interst; He placed the rest in a safe low risk fund that pay interest. At the end of one

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We are solving equations with variable on both sides. Could really use some help understanding this problem. Thanks.

3/4 t - 5/6 = 2/3t

2/3a - 3/4 = 3/4a

There are a cou hi my name is darrien I am in the 7th grade and I need a example of how to work out this problem.5:1=30:x or x:21=2:3=