13. At an enrichment camp, the number of boys was 45% of the number of girls. When 20% of the boys left the camp, there were 192 more girls than boys. How many children were at the camp at first?
G -- > 100%
B -- > 45%
20% x 45% = 9%
45 – 9 = 36
100 – 36 = 64
64% -- > 192
145% -- > 145/64 x 192 = 435 children
There were 435 children at the camp at first.
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