Pam laid 60 tiles on Saturday.
Lets break it down:
Over all, she laid down 80 tiles, 3 times as much on Saturday than Sunday.
Saturday Sunday
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3 1
3+1= 4
So now we know what to divide 80 by (4).
80÷4= 20
20×3= 60 (We do this because it is 3 times as much)
Hope this helps!
