exam Maths Puzzle Numerical Ability

Angela calculates the sum of the interior angles of a regular 13-gon by multiplying 13 by 180 degrees to arrive at 2340 degrees. What mistake has Angela made and what is the correc

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4n + 1 <9

x/2 + 9<11

5 < m/8 + 5

8k - 3 > -27

9(x+3)= 4x - 3

I do not understand how to do these problems. I had gotten no directions. If possible, could yo sit ups #of students
20 5
21 3
25 2
27 2

the table above shows the number of sit ups completed by 12 students in gym class. what is th