Find the missing number

Question

The numbers in each of the three brackets follow the same rule. Find the missing number.

(10, 50, 15)          (37, 120, 23)                        (16, 56, ?)
a. 8                      b. 10                      c. 12                       d. 14

 

Answer 1

The first and the third numbers added together equals 1/2 the second number.

 

10 + 15 = 25 = 1/2 * 50

37 + 23 = 60 = 1/2 * 120, thus

16 + x = 1/2 * 56

16 + x = 28

x = 28 - 16 = 12

Answer is c.

 

Answer 2

The middle number is 2 times the sum of the first and the last number. This will help you find the answer.