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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book Other Question

Multiply the following fraction.

2x^2 - x - 3/3x^2 + 7x + 4 times 3x^2 - 11x - 20/4x^2 - 9

Thanks! Fill in the blanks:

_ _ - ( _ / _ ) =9

the only numbers you can use are 3, 4, 6, 8, and 9

the same goes for this problem:

_ _ / _ + _ _ = 418