Exam Maths Puzzle Numerical Ability Number System

f(x) and g(x) are two functions defined as:
f(x) = 2x + 3 and g(x) = 3x + 7, then what is the value of g(f(5))?
Option
(a) 51
(b) 42
(c) 46
(d) 37

Read Solution (Total 2)

f(x) = (2x+3) => f(5)=(2*5+3)=13

g(x) = (3x+7)
=> g(f(5))=g(13)=(3*13+7)=46
10 years agoHelpfull: Yes(3) No(0)

f(x)=2x+3 so f(5)=2(5)+3=13
then,g(f(5))=g(13)
g(x)=3x+7=3(13)+7=46
ans=46
10 years agoHelpfull: Yes(0) No(0)

Exam Other Question

The average age of a class of 60 students is 12 years. If the number of girls is increased by 3/4th and the number of boys is decreased by half, the total number of students does not change; nor does the average age of either the boys or the girls change. But the combined average age changes to 13.5 years. The average age of the boys is
Option
(a) 8 years
(b) 10 years
(c) 12 years
(d) Cannot be determined when a number is written in base b we have 12*25=333. what is the value of b?