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In detail

Three kids with t-shirt

Three children take the stage of a large theater with a large number drawn on the front of their shirt. The numbers they have drawn are respectively 1, 3 and 6. They face the public and ask to be placed so that the resulting three-digit number is divisible by seven.
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In detail

Parallel lines

The following images show a series of parallel or almost parallel lines with another series of lines that interfere and make it difficult to observe when determining whether the lines are effectively parallel or not. Of all the images shown, you can say Which images show parallel lines and which do not?
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