A man invested a certain amount of money at 3% and twice as much at 9%, giving the annual income of 315. How much did he invest in each rate?

JP tang wrote:A man invested a certain amount of money at 3% and twice as much at 9%, giving the annual income of 315. How much did he invest in each rate?

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`table:`

| amt | rate | total

--------------------------

$ | x | 0.03 | 0.03x

twice | 2x | 0.09 | 0.18x

total | 3x | NA | 315