1. At a party, there were an equal number of boys and girls at first. Halfway through the party, 8 boys left and 4 girls joined the party. In the end, there were thrice as many girls as boys at the party. How many boys were at the party at first?
2. Ray and Ken had the same number of cards at first. After Ray and Ken lost 36 cards and 6 cards respectively, Ken had thrice as many cards as Ray. How many cards did each of them have at first?
3. Mrs Tan had a total of 115 oranges and apples. She sold half of the apples and 25 oranges. In the end, she had an equal number of oranges and apples left. Find the number of oranges Mrs Tan had at first.
4. Ram and Xen had a total of 216 stickers at first. After Ram bought another 24 stickers and Xen gave away 60 of his stickers to David, both of them had the same number of stickers left. How many stickers did Ram have at first?
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