DAY 80:

Today’s Challenge

Each of the nine letters, A-I, in the two sections below has a subtraction calculation attached to it.  Which is the only letter that has the same answer in both sections?

  • Section 1

C:24–13  G:14–6  D:20–10  E:15–7  I:14–9  F:18–11  B:9–2  A:17–5  H:25–12

  • Section 2

I:16–3  A:15–1  H:20–8  C:19–9  G:12–4  E:11–5  F:21–6  D:14–7  B:27–18

The 7puzzle Challenge

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

The 4th & 7th rows contain the following fourteen numbers:

3   4   10   11   24   27   30   32   35   44   54   60   70   77

What is the difference between the highest and lowest multiples of 4?

Make 80 Challenge

Can you arrive at 80 by inserting 4, 5, 8 and 10 into the gaps on each line?

  •  ×+×◯ = 80
  •  ◯××() = 80
  •  ◯××()² = 80
  •  ()×()² = 80
  •  ◯³+×÷◯ = 80

Answers can be found here.

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