Question

if cost of 8kg sardiness is rs.400.find the cost of 3kg sardiness​

Answer 1

Answer:

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Answer 2

$\mathfrak{\large{\underline{\underline{Answer :-}}}}$

The cost of 3 kg is Rs.150

$\mathfrak{\large{\underline{\underline{Explanation :-}}}}$

Given :

8 kg costs = Rs. 400

To Find :

Cost of 3 kg

Solution :

$\textbf{Method I}$

By Proportion -

Consider the cost of 3 kg as x

8 : 400 : : 3 : x

Mean Terms = 400 and 3

Extreme Terms = 8 and x

$\boxed{\sf{Mean \times Mean\:Terms = Extreme \times Extreme \:Terms}}$

$\sf{\implies} \: 400 \times 3 = 8 \times x$

$\sf{\implies} \:1200 = 8x$

$\sf{\implies} \:x = \dfrac{1200}{8}$

$\sf{\implies} \:x = 150$

$\therefore$ The cost of 3 kg is Rs.150

$\rule{300}{1.5}$

$\textbf{Method II}$

By Unitary Method -

★ Cost of 1kg

$\sf{\implies} \: 400 \div8$

$\sf{\implies} \: 50$

★ Cost of 3kg

$\sf{\implies} \: 3 \times 50$

$\sf{\implies} \: 150$

$\therefore$ The cost of 3 kg is Rs.150