Select the missing number from the given responses :
`{:(7,14,19),(6,12,17),(5,10,?):}`

Options

A. 20
B. 18
C. 15
D. 16

Answer

C

Explanation

In each row the second number is twice of the first number and the third number is 5 more than that of the second number.
First Row
`7xx2=14," "14+5=19`
Second Row
`6xx2=12," "12+5=17`
third Row
`5xx2=10,10+5=15`