Answer:
Step-by-step explanation:
1 10
1 : 2 : 5
20 : 40 : 100 ( divide each part of the ratio by 20 , the HCF of 20, 40, 100 )
= 1 : 2 : 5
y = -12
-4 (8+3y) = 112
-32 -12y = 112
-12y = 144