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In 15 minutes Frankita created 15 drawings. In 30 minutes she created 17 drawings. In 45 minutes she created 20 drawings. In 60 minutes she created 24 drawings. If Frankita continues making drawings in the same pattern, how many total drawings will Frankita have created at the end of 90 minutes?


A. 19
B. 28
C. 33
D. 35

Answer 1

D. 35

Explanation:

the pattern followed by Frankita is:

15 min = 15 drawing

30 min = 17 drawing : increase by 2 (15+2 = 17)

45 min = 20 drawing : increase by 3 (17+3 = 20)

60 min = 24 drawing : increase by 4 (20+4 = 24)

75 min = 29 drawing : increase by 5 (24+5 = 29)

90 min = 35 drawing : increase by 6 (29+6 = 35)