myat88894 myat88894

11-09-2022
Mathematics

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89 children were at a party. When 50% of the girls and 20% of the boys left, there were 55 children remaining at the party. How many boys were at the party at first?

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tramphong2k2 tramphong2k2

11-09-2022

Answer:

Step-by-step explanation:

x: boy

y: girl

x+y=89 & 89-(0.2x+0.5y)=55

⇒x+y=89 & 0.2x+0.5y=34

⇒ x=35 & y=54

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