Altogether 4004

Karel decided to learn the selected words gradually. On the first day, he learned 2 times more than the fifth; on the second day 3, times more than the first; on the third day 1, time more than the first; on the fourth day 5, times more than the third; and on the fifth day, he learned only one selected word. How many choice words did Karel learn altogether?

Correct answer:

x =  21

Step-by-step explanation:

f=1 a=2 f=2 1=2 b=3 a=3 2=6 c=1 a=1 2=2 d=5 c=5 2=10 x=a+b+c+d+f=2+6+2+10+1=21

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