book Maths Puzzle Numerical Ability

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=

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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 WHAT IS NANOGRAM