Question

i. Ali’s average marks for 5 subjects are 80. Find his total marks.
i. 16
ii. 85
iii. 400
iv. 450

Answer 1

Answer:

iii. 400

Step-by-step explanation:

We know,

Average = ( sum of quantities ) ÷ ( no. of quantities )

 

       Here,

 Ali's average marks for 5 subjects are 80.

It means :

  Average is 80 and sum of quantities( here subjects ) is 5.

⇒ 80 = ( sum of marks ) ÷ 5

⇒ 80 * 5 = sum of marks

⇒ 400 = sum of marks

      Hence his total mark is 400.

Answer 2

Answer:

• Average : Average is defined as a value found by adding all of the numbers in a set together and then dividing them by the quantity.

$\rule{120}{1}$

$\underline{\bigstar\:\:\textsf{According to the Question :}}$

$:\implies\sf Average=\frac{Sum\:of\:the\:Terms}{Number\:of\:the\:Terms}$

⠀

$:\implies\sf 80=\frac{Sum\:of\:the\: Terms}{5}$

⠀

$:\implies\sf 80 \times 5=Sum\:of\:the\: Terms$

⠀

$:\implies\underline{\boxed{\sf Sum\:of\:the\:Terms=400}}$

⠀

$\therefore\:\underline{\textsf{Ali's total marks will be iii) \textbf{400}}}.$