Combined 81039

Katka has k marbles, Petra has 20 more marbles than Katka, and Lenka has 30 marbles less than Petra and Katka combined. How many marbles do they all have in total?

Correct answer:

x = 4k+10

Step-by-step explanation:

p=20+k l=p+k30=20+k+k30=2k10  x=p+l+k x=20+k+(p+k30)+k x=20+k+20+k+k30+k  x=4k+10



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