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Workings

Hint
It might be easier to work backwards.

Answer
£5.00.

Reasoning
Working backwards:

On Thursday, I had £1.25.

On Wednesday, I had £1.25 x (1 ÷ one half) = £2.50.

On Tuesday, I had £2.50 x (1 ÷ two thirds) = £3.75.

On Monday, I had £3.75 x (1 ÷ three quarters) = £5.00.

Workings

Hint
The 2^nd letter can only be H or U.

Answer
Kung fu.

Reasoning
The 1^st letter can only be: D E K N O
The 2^nd letter can only be: H U
The 3^rd letter can only be: B N O W
The 4^th letter can only be: G L
The 5^th letter can only be: F L Y
The 6^th letter can only be: R U

Workings

Hint
The country spans more than one word.

Answer
Sweden.

As managerS, WE DENy all involvement in the unscrupulous dealings that have come to light in the recent interdepartmental investigation.

Workings

Hint
You can either fix the distance rowed and see what numbers work, or you can fix the number of hours.

Answer
12 miles.

In the morning, rowing at 2 miles per hour, they rowed for 6 hours. In the afternoon, rowing at 4 miles per hour, they rowed for 3 hours.

There are a number of ways of working this out, and here are two of them:

Method 1
If we assume the distance the rowed upstream to be D miles, we know the morning took (D ÷ 2) hours, and the afternoon took (D ÷ 4) hours, with a difference of 3 hours. So:
 D   D
 - – - = 3
 2   4

Multiplying throughout by 4 gives:

 2D – D = 12

So:

 D = 12 miles

They rowed 12 miles upstream.

Method 2
If we assume they rowed for H hours upstream, we know they travelled H x 2 miles in the morning. In the afternoon, they rowed for (H – 3) hours, and travelled (H – 3) x 4 miles. We know these distances are the same, so:

 2H = (H – 3) x 4

Giving:

 2H = 4H – 12

Rearranging gives:

 12 = 2H

So:

 H = 6 hours

They rowed for 6 hours upstream at 2 miles per hour, which is a total of 12 miles.