# Arrange the numbers 1-9 in a 3×3 square using each only once

Arrange the numbers 1-9 in a 3×3 square using each once only, according to the following rules:

• exactly one prime number is directly above a prime number that’s two numbers less;
• each pair of opposite corners sums to the same square total and exactly two columns share another square total;
• exactly one prime number is directly to the left of a non-prime number that’s two numbers greater;
• directly above exactly one square number is a number that’s four numbers greater; and
• directly to the right of exactly one cubic number is a number that’s one number greater.

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## Calculate the velocity of water coming out of a double-entry pipe

If we know the volumetric flow rates of the water going into the two branches, …

1. Does this work too?

7 8 9
2 4 5
1 6 3

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