Brain Teasers and Riddles

Dividing 30 by 1/2 equals 30 x 2 = 60. Adding 10 gives 70. Option A (25) mistakenly calculates 30 ÷ 2, while options C and D are other incorrect results. Remember: dividing by a fraction means multiplying by its reciprocal.

If you take away 2 apples, you possess those 2 apples - not the 1 apple remaining. The phrase 'how many do you have' refers to what you took, not what's left behind. Option A is a trap for those who count remaining apples.

Take first pill at time 0, second at 30 minutes, third at 60 minutes. The three pills last 60 minutes total, not 90 or 120. Option A (30) assumes only the interval between doses, not the full duration. Key: 'every half hour' means spaced 30 minutes apart.

The phrase 'all but 9 die' means 9 sheep survive. So 9 sheep are left alive. Options 17, 8, and 7 are incorrect - they misunderstand the meaning of 'all but 9'.

A dozen always means 12 items, regardless of what those items are. The question asks about the number of stamps, not their total monetary value. Each stamp is worth 2 cents, but there are still 12 stamps in a dozen.

In baseball, one full inning consists of 6 outs - 3 outs for each team. A half-inning (one team's turn at bat) has 3 outs. The options 2, 3, and 4 are incorrect as they don't account for both teams' outs in a complete inning.