Answer:
12
Explanation:
△ABC ≅ △DEF means that these two triangles are congruent to each other. Congruent triangles also have corresponding sides and angles that are equal to each other!
This means that angle A corresponds to angle D; and thus, we can set up in equation for these two to solve for y.
First, let's try to decipher what exactly we are solving. Y is what we are multiplying by five to get 60°, or angle A (congruent angle).
Now, we just solve it!
![60=5y](https://img.qammunity.org/2021/formulas/mathematics/high-school/82u4evxs9t57d5nas1agbku3483sfv322r.png)
y=12