Rekha wants to hang four equal sized square pictures on her wall. Her mom says it’s O.K., but she has to
use the absolute minimum number of tacks to hang them. Rekha insists that she must put one tack in each
corner of each photo. What is the smallest number of tacks Louise need?With explaination.
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Answer:
smallest number of tacks Louise need = 9
Step-by-step explanation:
Rekha insists that she must put one tack in each corner of each photo.
So simply seeing it looks like that
4 * 4 = 16 Tack required
But if she put Pictures in below way
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we Can see that two corners of each photo is Shared with other two
one corner of each photo is unshared
& one corner is common for all photos (shared by all 4 photos)
so tacks required = 4 *1 + 4 * (2/2 ) + 4 * 1/4
= 4 + 4 + 1
= 9
smallest number of tacks Louise need = 9
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