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https://www.tes.com/magazine/archive/brainteasers-59
More brainteasers on www.tes.co.ukteacherbrainteasers Age 7 to 10 Mrs Singh spent pound;10 on 60p and 70p stamps. She bought 3 times as many 60p stamps as 70p stamps. How many of each kind of stamp did Mrs Singh buy? Age 11 to 14 Consecutive integers The consecutive integers 5, 6, 7 and 8 have a product of 1,680 and a sum of 26. The product of 4 consecutive integers is 358,800. What is the sum of these 4 integers? SOLUTIONS Mrs Singh’s stamps Mrs Singh bought 12 stamps at 60p and 4 stamps at 70p. Since she bought 3 60p stamps for every one 70p stamp, the cost of one lot of 4 stamps is pound;2.50. For pound;10, she can buy 4 lots of 4 stamps. Consecutive integers The integers are 23, 24, 25 and 26, which sum to 98.
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