Earlier 4970

Tomáš and Lukáš read the same book. Tomas read 21 pages a day and read it one day earlier than Luke, who read 18 pages a day. How many pages did the book have?

Correct answer:

s =  126

Step-by-step explanation:


s=21t
s = 18(t+1)

s=21·t
s = 18·(t+1)

s-21t = 0
s-18t = 18

Row 2 - Row 1 → Row 2
s-21t = 0
3t = 18


t = 18/3 = 6
s = 0+21t = 0+21 · 6 = 126

s = 126
t = 6

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