Level 3
Ming Huat had 255 watermelons and 240 oranges at first. He used 35 of the watermelons and 34 of the oranges. He then bought some more oranges. In the end, 18 of the fruits he had left were watermelons. How many oranges did he buy?
Level 2
Ben thought of a fraction. He multiplied the fraction by 25. then he added 8 to the answer. He got 23 as the answer. What is the fraction that Ben thought of? Express the answer in the simplest form.