book Maths Puzzle Numerical Ability

Can someone please help me with this word problem?
Suppose you invest $12,000 in two funds paying 10.5% and 13% smple interest. The total anual interest is $1447.50. How much is i

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book Other Question
The sum of the counting numbers from 1 to 5 can be represented by drawing a triangle of dots as shown at left. A rectangle can be formed by copying the triangle and rotating it. Th factor by grouping x^3+6x^2+x+6