Slater used 7 black Legos, and 21 green Legos to build a tower. What was the radio of the number of black legos to the number of Legos in the tower
1:4
1:3
4:1
7:4
7:28
Therefore, the ratio is 7:28, which simplifies to 1:4. So, the ratio of the number of black Legos to the total number of Legos in the tower is 1:4.