exam Maths Puzzle Numerical Ability

Yolanda invested a portion of $14,000 at 7.25% interest and the balance at 9.5% interest. How much did Yolanda invest at each rate if her total income from both investments was $1240 after one year?

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A card company mixes two varieties of cards. Embossed cards cost $.65 each, and regular cards $.40 each. How many cards of each type should be included in an assortment of 25 cards that costs $14? FOR THE FUNCTION DEFINED BY f(x)=5x-4,FIND A FORMULA FOR f^-1(x).