exam Maths Puzzle Numerical Ability

Kermit and Miss piggy wish to invest $5,000. Part at 8% simple interest and the rest at 14% simple interest. If they must earn $610 in interest by the end of one year,how much should they invest at each rate?

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I am hoping one of the tutors has the text (Basic Technical Mathematics with Calculus 8th Edition)to help me.
It is #50 page 243. Diagram is necessary and I don't know how to show
HELP!!!! PLEASE!!!!
0<(9x-24)^negative one < one third