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1/4 of a number is 20. What is 5 times the number?

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Dipen and Nisha are planning their wedding reception. Nisha says, “I want to invite 70 guests.” Dipen says, “If we invite one-fifth fewer guests, we will save more than £500” Is Dipen correct? (Taken from Nov 2014 AQA Unit 2)

Tom thinks of a number. He squares it, adds 3 times the original number and then subtracts 18. The result is 0. What two numbers could Tom have been thinking of?

Solve the simultaneous equations 2x + 7y = 15 and 3x + 6y = 21

Solving simultaneous questions, e.g. 3x + y = 11 and 2x + y = 8

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