**Today’s Challenge**

This *Octaplus* puzzle challenges you to find the values of eight letters, A to H, from the given information below. Each letter is a different whole number in the range 1-50:

- H is a third of F,
- B is half of F,
- D minus F is either 15 or 16,
- One-seventh of D is a whole number and odd,
- E equals H plus D,
- G equals E minus B,
- C is a fifth of G,
- A is equal to 120 minus the sum of the other seven numbers.

What is the value of each of the eight letters?

**The 7puzzle Challenge**

The playing board of **the 7puzzle game** is a 7-by-7 grid containing 49 different numbers, ranging from **2 **up to **84**.

The 1st & 2nd rows of the playing board contain the following fourteen numbers:

2 8 9 14 15 17 22 28 40 48 55 63 64 72

What is the difference between the highest and lowest prime numbers?

**Make 5 Challenge**

Can you arrive at 5 by inserting 5, 10, 15 and 20 into the gaps on each line?

- (◯÷◯)+(◯÷◯) = 5
- (◯–◯)×◯÷◯ = 5
- ◯–(◯×◯÷◯) = 5
- ◯–(◯–◯)²÷◯ = 5 (there are 2 ways)
- √[(◯×◯÷◯)–◯] = 5

**Answers **can be found **here**.

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