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# Weekly Brain Teaser

Every week we feature a Brain Teaser or a thought-provoking question.

If you have one that you would like to share with fellow engineers, please email it to info@engineeringdaily.net.

This week’s brain teaser

Solve the following with the conditions given:

DA – BC = BD

a) All the numbers used A, B, C and D are prime

b) The answer BD is also a prime number

c) The numbers DA and BC are not prime

d) Also the number A < C

Find the numbers A, B, C and D

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How good are you in calculating? | Back – Next | Do you remember algebra?

## 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. A = 2
B = 3
C = 5
D = 7

DA ( 72 ) – BC ( 35 ) = BD ( 37 )

Not Prime: 72, 35
Prime: 37

2. Just to clarify, the pairs (B & D, D & A, B & C) represent individual numbers not multiples.

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