if tomorrow is Friday,after 87 days it will be
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Day of the week comes every 7 days.
If tomorrow is Friday,
⇒ Today is Thursday
⇒ Every 7 days later will still be a Thursday
Number the number of 7s in 87:
Number of 7s = 87 ÷ 7
Number of 7s = 12 remainder 3
Find the day after 87 days:
12 x 7 = 84
⇒ It will be still be Thursday after 84 days
Number of days left after 84 days = 87 - 84
Number of days left after 84 days = 3
3 days after Thursday will be Sunday.
Answer: Sunday
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