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Daily Mail Mindbender Sandbags 30Th Sept
2 Answers
I am totally stuck on this one, the published answer is 640 but I cannot even work it backwards knowing the answer.
In preparation for a flood, emergency services sourced sandbags for the properties on Deluge Crescent, offering 15 sandbags per house, and 18 per block of flats. 30 properties collected bags, which represented four-fifths of the houses and two-thirds of the flat blocks. If emergency services set aside 1,000 bags for Deluge Crescent, how many went unclaimed.
In preparation for a flood, emergency services sourced sandbags for the properties on Deluge Crescent, offering 15 sandbags per house, and 18 per block of flats. 30 properties collected bags, which represented four-fifths of the houses and two-thirds of the flat blocks. If emergency services set aside 1,000 bags for Deluge Crescent, how many went unclaimed.
Answers
4/5 of houses means each house took 12 bags on average (4/5 x 15). Similarly 2/3 of flats means each flat also took 12 bags on average (2/3 x 18). So, with both flats and houses taking 12 bags on average, the 30 properties took 360 (30 x 12). With 1000 allocated 640 were unclaimed (1000 - 360).
19:59 Mon 02nd Jan 2023
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