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Workings

Hints
The first letters of the words are: R, C, G, C, L, H, E, B, L.

Answers
18 8 9 14 15          = rhino 3 18 15 3 15 4 9 12 5 = crocodile 7 9 18 1 6 6 5        = giraffe 3 8 5 5 20 1 8        = cheetah 12 5 15 16 1 18 4     = leopard 8 9 16 16 15          = hippo 5 12 5 16 8 1 14 20   = elephant 2 21 6 6 1 12 15      = buffalo 12 9 15 14            = lion

Workings

Hint
Light travels around 186,000 miles each second.

Answer
Miles that light can travel in 3 minutes.

There are 31,536,000 seconds in a typical year, and light can travel about 33,530,831 miles in 3 minutes.

Workings

Hints
The first letters of the words are: P, M, T, M, R, T, W, T, L, T.

Answers
parasite marginal tangible medicate reactive teaching woodland treading latitude teenager

Workings

Hint
You don't need to use a calculator.

Answer
Cube root of 2.

Reasoning
We could use a calculator to see that the tenth root of 10 = 1.2589 and the cube root of 2 = 1.2599.

But, if you've not got your calculator handy…

We have:

   10^1/₁₀ or 2^1/₃

Raise each to the power of 30 (since 10 x 3 = 30) to give:

   (10^1/₁₀)³⁰ or (2^1/₃)³⁰

   10^{1/₁₀ x 30} or 2^{1/₃ x 30}

   10³ or 2¹⁰

   1000 or 1024

Therefore, the cube root of 2 is larger.