book Maths Puzzle Numerical Ability

Hassan invested $7000 for one year. He invested part of it in a high-risk fund the pay 7% interst.At the endof one year he earned $ 730 in simple interst. How much did he invest in

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can you please solve this equation 11(4-6y)+5(13y+1)=9 Don has 80 coins. He has 4 times as many dimes as nickels and the remaining are pennies. With a single variable, express the number.