Logic and number words

Swap every letter for the number it stands for

提示The values are given at the start — trade the symbols in first.

为什么Once A = 2 and B = 5 become plain numbers, the sum is ordinary arithmetic. Copy carefully — a mis-copied value wrecks a correct method.

No — work strictly left to right, in the order written

提示School habits mislead you here — take the sum exactly as it comes.

为什么In class, multiplying would come before adding; in these puzzles each step is applied as you meet it. Here 2 + 3 × 4 means 5 × 4 = 20, not 14.

Follow the sentence step by step from the given number

提示Treat it like a recipe — one instruction at a time, in order.

为什么Write the running total down after every instruction; holding it in your head is where slips happen.

2 and 3

提示Twins for the first word; triplets for the second.

为什么"Treble" appears far less often than "double" in everyday talk, which is exactly why papers use it. These little words carry the whole instruction.

Divide it by two

提示Share it into a pair of equal parts and keep one.

为什么Halving 18 gives 9. Watch for chains: "double it, then halve it" lands you back where you began.

Take the smaller away from the larger

提示It measures the gap, so the answer is never negative.

为什么The difference between 4 and 9 is 5. It is a subtraction in disguise — but always the small one from the big one.

The same relation links them in every worked example

提示Two finished sets show the trick — find what both have in common, then reuse it.

为什么Try the simple relations first: add the outside pair, find their difference, or multiply them — perhaps then halving or doubling. Whatever fits BOTH examples is the rule to apply to the third.

The full order of everyone involved

提示Placing just two people is not enough — the statements pin down the whole line-up.

为什么The right order is the only one that fits every statement at once. If two different orders both fit, re-read — you have missed a clue.

Rule out the impossible until one arrangement is left

提示Work like a detective — cross off whatever the clues forbid.

为什么Check every possibility against every clue rather than leaping at the first fit. The answer is the arrangement nothing forbids.

Add them together

提示Plus, in disguise.

为什么The sum of 7 and 5 is 12. Do not confuse it with the product, which multiplies them instead.