book Maths Puzzle Numerical Ability

a digital camera with a regular price of $325 is on sale for $201.50. find the markdown rate.

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Your help on this will be greatly appreciated.

A line is 5.6 units long and has one point at (5.1,6.3). The sum of the coordinates of the unknown endpoint is 15.3. What are th
In the linear transformations R3->R3, I want to know how the following cases look like graphically;
1) Rank=zero, Nullity=3
2) Rank=2, and Nullity=1,
I know for 1), they are a p