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Question

There were some adults and children at a party. 190 more boys then
joined In, while 65 adults left As a result the percentage of girls in
party decreased from 38% to24%.

a)Find the percentage increase in the total number of people at the
party.

b) Find the number of girls at the party

Answer

Amending 38% to 39%, my solution to the question is as follows :

(a)
Assuming total number of people at first = 100 units,
190 – 65 = 125
39 units/(100 units + 125) = 24/100
3900 units = 2400 units + 3000
1 unit = 3000/(3900 – 2400) = 2
[125/(2 x 100)] x 100% = 62.5%

(b)
39 units = 39 x 2 = 78

Ans : (a) 62.5%; (b) 78 girls.

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Apologies. Girls should be 36%. Thanks for the solution

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There are some adults and children at a party. 190 more boys then joined in, while 65 adults left. As a result, the percentage of girls in the party decreased from 36% to 24%. (a) Find the percentage increase in the total number of people at the party. (b) Find the number of girls at the party.

(a)
“The percentage of girls at the party decreased from 36% to 24% implies” :
At first :
(adults + boys) ——-> 64%
In the end :
adults – 65 + boys + 190 = (adults + boys) + 125 ——-> 76%
64u + 125 ——-> 76p
36u ——-> 24p
3u ——-> 2p
64u + 125 ——-> 114u
1u ——-> 2.5
100u ——-> 250
125/250 = 50%

(b)
36 x 2.5 = 90

Ans : (a) 50%; (b) 90 girls.

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