Hard Puzzles 

Find two words, which are anagrams of each other, which complete this sentence:
Due to a recent outbreak of a {?} infection in the zebra house, the local animal sanctuary had to {?} their electron microscope correctly, to ensure rapid detection.

Puzzle Copyright © Kevin Stone

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Tuif cumzye if n fizpye trsg go sre hbw ensl n EOG13 caet eaceyctrd phzmlr paa oe. Rvrrl btuee yegtrr hns brea poavrrgeq go RBT13 aad tue oghrr lrtgees aee lrfg ns tuel jeee. Oug, ybu mny afk, jhnt if ghr cumzye? Wrly, hbw mnnl joedf nrr vn tuif cumzye!

Puzzle Copyright © Kevin Stone

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What comes next in this sequence:

dog  cat  mouse  mole  deer  pig  {?}
Choose from:

llama, cow, rabbit, frog

Puzzle Copyright © Kevin Stone

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The local CD shop operates an unusual discount policy. The discount on the next purchase is worked out on the current purchase in the following way: for every whole pound spent you get 0.5% discount on the next purchase. For example, if you purchased £8.99 on the first purchase, you would then get a 4% discount on the next purchase and so on. You can make as many purchases as necessary.

You need to buy 7 CDs, costing, £11.50, £12.00, £12.00, £12.50, £13.00, £13.00 and £14.50. What is the cheapest method of buying them?

Puzzle Copyright © Kevin Stone

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