exam Maths Puzzle Numerical Ability

Mrs. Jones invested a total of $12,000, part at 10% and the rest at 5%. If the income from her 10% investment was 6 times as great as the income from 5% investment, how much was invested at each rate?

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exam Other Question

For an account that earns simple annual interest,find the interest and the balance of the account.

P= $4500 ,r = 4%,t = 15 years

Any help with this equation would Greatly</b> appreciated. Could you please help me solve this problem: Give an example for f(x), if f(x) is an increasing function between 2 and 3.

Thanks for your help.