The rod

The rod has a length of 90cm. Half is painted blue, the third is red, and the rest is yellow. How long is the yellow part of the rod?

Correct answer:

z =  15 cm

Step-by-step explanation:

90 = 90/2 + 90/3 + z

6z = 90

z = 90/6 = 15

z = 15

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