Collection 13863

Vendelín has 4/5 the number of colored pencils. But if Maruška took 1/2 of it, there would be 20 crayons left.

How many crayons were still in the penalty before Vendelín's collection?

Correct answer:

p =  50

Step-by-step explanation:

v = 4/5 p
v - v/2=20

v = 4/5·p
v - v/2=20

4p-5v = 0
v = 40

v = 40/1 = 40
p = 0+5v/4 = 0+5 · 40/4 = 50

p = 50
v = 40

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