Leo has three times as many colored marbles as he has see-though marbles. In total, he has 60 marbles. How many see-through marbles does he have?

15

Step-by-step explanation:

If the colored marbles are three times as many as the see-through marbles, and the number of see-through marbles added to the number of colored marbles is 60, then there are 15 see-through marbles. 3 multiplied by 15 is 45, and 45 added to 15 is 60. I hope you found this helpful!

2.2°  

step-by-step explanation:

let θ = the angle of elevation.

tanθ =77/2020

tanθ = 0.038 12

      θ = tan⁻¹0.038 12

      θ = 2.2°