book Maths Puzzle Numerical Ability

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.

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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 does a midline always divide a trianle into two triangles of equal area?