Respuesta :
Answer:
70
Step-by-step explanation:
let x= no of children, y = no of parents, z= no of grandparents.
so according to question condition .... y = 2z, x= y+50 and x+y+z= 400.
hence on solving above all three equation....
x = no of children = 190 Answer
y= no of parents = 140 Answer
z= no of grandparents = 70 Answer
The number of people in attendance are:
Children=70
Parents=140
Grandparents=190
Let
C represent children
P represent parents
G represent grandparents
Hence:
children+parents+ grandparent=400
P=2G
C=P+50 = 2G+50
2G+50 + 2G + G =400
5G=400-50
5G = 350
G=350/5
G =70 grandparents
P=70×2
P =140 parents
C=140+50
C =190 children
Inconclusion The number of people in attendance are:
Children=70
Parents=140
Grandparents=190
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