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Since 65 adults left and 190 Boys joined the party,

Increase in total Adults + Boys = 190 – 65 = 125

  Girls Adults + Boys Total
Before 36u 64u 100u
After 24P 76P 100P

Since there is no change in girls,

24P = 36u

1P = 1.5u

There is an increase of 125 people in Adults + Boys,

76P = 64u + 125

76 x 1.5u = 64u + 125

114u = 64u + 125

1u = 2.5

a) Total number of people at the beginning -> 100u = 100 x 2.5 = 250

Total number of people at the end -> 100u + 125 = 250 + 125 = 375

% increase in total number of people = (375 – 250)/250 x 100% = 50%

b) Number of girls -> 36u = 36 x 2.5 = 90

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