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John’s weight decreased from 45 kg last year to 40 kg this year. Calculate the percentage change in his mass.
Box A is 20% heavier than Box B. Box B is 20% lighter than Box C. Express the mass of Box A as a percentage of the mass of Box C.
John had 30% as many beads as Peter and 20% fewer beads than Yenni. Peter had 100 more beads than Yenni. How many beads does John have?
Yenni bought 4 crates of oranges, and each crate contained 12 oranges. Peter bought 3 boxes of oranges, and each box had 10 oranges. How many percent more oranges did Yenni buy than Peter?