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lana66690 [7]
3 years ago
13

What is the value of y?

Mathematics
2 answers:
kkurt [141]3 years ago
5 0
180 = y + y + 30 + 40
180 = 2y + 70
180 - 70 = 2y
110 = 2y
y = 110/2
y = 55
dimaraw [331]3 years ago
5 0

the sum of triangle is 180:

y + 40 + y + 30 = 180 \\ 2y + 70 = 180 \\ 2y = 180 - 70 \\ 2y = 110 \\ y =  \frac{110}{2}  \\ y = 55

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