Can someone help me this question is different from the others

Answer:
15
Step-by-step explanation:
y= 15 because 5 x 15 is 75 and 51+54+75= 180
Answer:
y=15
Step-by-step explanation:
51+54=105
180-105=75
75÷5=15
y=15
OR
5y+51+54=180⁰
5y+51=126
5y=75
y=75÷5
y=15