exam Maths Puzzle Numerical Ability

A personn invested 10,000. The greater part is invested at 6% and the remainder at 5%. The annual income from the greater part is $160 more than the annual income form the smaller part. what is the smaller part of the the investment?

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exam Other Question
Fund the domain of the function:

f(x)=square root of 81-x squared what formula to use when the question states
"For a rectangle where the Perimeter=43cm and the Width=3.4cm, find the length"

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"Find the Area formula to find the missing dimension of the following rectangle"
A=96m2, l=7.2m, w=?