Multiple choice general knowledge math & puzzles

If r=3y, 15y=30z and 2z=p/3 then r=?

  1. p/3

  2. p/5

  3. p

  4. p/2
Reveal answer Fill a bubble to check yourself
C Correct answer
Explanation

From 15y=30z, we get y=2z. From 2z=p/3, we get z=p/6. Substituting: y=2×(p/6)=p/3. Then r=3y=3×(p/3)=p. The key is working backwards from the final equation to express all variables in terms of p.

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