Mathematics
Grade-4-
Easy

Question

Denny sent 3 e-mails on Sunday, 10 e-mails on Monday, 31 e-mails on Tuesday, 94 e-mails on Wednesday, and 283 e-mails on Thursday. If this pattern continues, the number of e-mails Denny will send on Friday is ____________

  1. 580    
  2. 650    
  3. 850    
  4. 950    

Hint:

In the question, we are required to identify the pattern in which Denny sent emails. The number of emails sent on Sunday, Monday, Tuesday, Wednesday, Thursday are given. We are required to identify the rule to find the number of emails Denny sent on Friday.

The correct answer is: 850


    Step by step solution:
    number of emails Denny sent on Sunday = 3
    number of emails Denny sent on Monday = 10 = 3 x 3 + 1
    number of emails Denny sent on Tuesday = 31 = 10 x 3 + 1
    number of emails Denny sent on Wednesday = 94 = 31 x 3 + 1
    number of emails Denny sent on Thursday = 283 = 94 x 3 + 1
    Thus, the rule is as follows:
    number of emails sent by Denny on a particular day = (number of emails sent by Denny on the previous day) x 3 + 1
    Thus, number of emails sent by Denny on Friday = number of emails sent by Denny on Thursday x 3 + 1 = 283 x 3 + 1 = 850
    Thus, Denny sent 850 emails on Friday.
    Hence, option(c) is the correct option.

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