exam Maths Puzzle Numerical Ability

x-y<-11

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When a positive integer "k" is divided by 6, the remainder is 1. What is the remainder when 5k is divided by 3?
thank you very much Sally bought 3 chocolate bars and a pack of gum and paid $1.75. Jake bought 2 chocolate bars and 4 packs of gum and paid $2.00. Find the cost of a chocolate bar and the cost of a pack of gum.