Question

Numbers $a,b,c,d$ and $e$ form an arithmetic sequence. If $b=5.5$ and $e=10$, what is the value of '$a$'?

• A. $0.5$
• B. $3$
• C. $4$
• D. $4.5$

Answer 1

Answer: (C)

$4$

Let $a=A-D$

$b=A$

$c=A+D$

$d=A+2D$

$e=A+3D$

$\therefore b=A=5.5$

$\therefore e=A+3D=10$

$\Rightarrow 3D=10-5.5=4.5$

$\therefore D=1.5$

$\therefore a=A-D=5.5-1.5=4$

Hence, the answer is $4$.