exam Maths Puzzle Numerical Ability

Can you please help me figure how to solve this question.

Solve for b. a = 1/2bc2

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exam Other Question

Describe a situation where you would round as indicated? 1.to the nearest whole? (?time), 2. to the nearest tenth? (?fractions), 3. to the nearest hundredth? (?equations)
thanks Joel had thrice as many blue pens as black pens. When he sold 222 blue pens and 42 black pens, he had thrice as many black pens as blue pens left. How many black pens did he have a