Question

A 60-litre tank was full of oil. sam used 40% of it and poured the rest into 40 litre tank.
{i} what percent of the 40 litre tank was filled with oil ?
{ii} if sam used 3 litres of oil daily, what percent of oil in the 40 litre tank would be used in 10 days?

Answer 1

$\underline{\underline{\bf{Question}}}$

A 60-litre tank was full of oil . Sam used 40% of it and poured the rest into 40 litre tank.

{i} what percent of the 40 litre tank was filled with oil ?

{ii} if sam used 3 litres of oil daily, what percent of oil in the 40 litre tank would be used in 10 days?

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$✿ \: \large{\red{ \sf Solution}}$

It's mentioned in the question that a tank of volume 60 litre was full of oil . This means that

Tank has amount of oil = 60 litre

✑ Sam used 40 % of the oil , so here first we will calculate the amount of oil used by Sam

$= \sf { \tt60} \times \dfrac{40}{100} = \bf 24 \: litres$

Therefore ,

The amount of oil left unused= 60 - 24 = 36 litre

$\rule{170pts}{1pts}$

◓ To calculate the percentage of oil in 40 litre tank .

% of oil in tank = (36 / 40) × 100 = 90 %

Answer of Part 1 .

$\colorbox{azure}{90 \: \%}$

$\rule{170pts}{1pts}$

Part ( 2 )

Now , if sam used 3 litres of oil daily so in 10 days he would have used = 3 × 10 = 30 litre of oil

Assume that q % of oil has been used

$\rightarrow \rm30 = \dfrac{q}{100} \times 36 = \colorbox{azure}{83.33 \: \% }$

Answer of Part 2 .

$\colorbox{azure}{83.33 \: \% }$

$\rule{170pts}{2pts}$

Note :-

In such type of questions , make use of each and every stated points which in turn would help to evaluate what actually is asked. In second part , Either you can assume the amount of oil used as q % or simply use Unitary Method.

Answer 2

Step-by-step explanation:

Given 3L per day and need to find pecentage used in 10 days of 40 L tank. So therefore the percentage will be 30/36*100 which = to 83.33%. Hence 83.33% is the answer.