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What is black ...?

What is black when it is clean and white when it is dirty?

Calculate the following expressions without a calculator. The result corresponds to a letter in a chart. Write this letter in each box containing the number of that exercise.

Expressions  

= 5 + (5 x 7 )

= 12 x (12 - 7)

= 15 - (5 : 5)

= (4 x 12) - (12 x 2)

= 15 - 5 - 2 + 7

= (14 : 7) + 7

= 16 - (5 x 2)

= (24 : 4) x 2

secret code
1 2 3 6 8 9 12 13
W T S R E D B Y
 
14 15 17 24 40 50 60 70
O L H C K N A I
Answer