book Maths Puzzle Numerical Ability

A coffee filter for a new coffee maker is to be designed using a conical filter. The filter is to be made from a circle or radius 10cm with a sector cut from it such that the volum

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how can i learn algebra? May I get some help with this please?:
A bank loaned out $120,000, part of it at the rate of 8% annual mortgage interest and the rest at the rate of 18% annual credit card interes