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At the start of a birthday party,there are 3 times more boys than girls. After 4 boys and 4 girls left the party,there were 4 times more boys than girls. How many boys were there at the start of the party

1 Answer

6 votes

Answer:


36\ boys

Explanation:

Let

x------> number of boys at the start of the party

y-----> number of girls at the start of the party

we know that


x=3y ------> equation A


(x-4)=4(y-4) -----> equation B

substitute equation A in equation B and solve for y


(3y-4)=4(y-4)


3y-4=4y-16


4y-3y=16-4


y=12\ girls

Find the value of x


x=3y ------>
x=3(12)=36\ boys

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