Question

The price of 15 articles is 360. Find the price of 21 articles.
A car travels 180 km in 4 hours. How long will it take to travel 400 km​

Answer 1

Answer:

504

Step-by-step explanation:

15 articles --360/-

21 articles --?/-

cross multiply them

15x=21×360

x=21×360÷15

after all cancellations

x=7×72

x=504

hope it helps u

Answer 2

Analysis

In both the questions, we have to implement the process of unitary method to derive the answer.

Answers:

Question 1:

Price of 15 articles = Rs 360

∴ Price of 1 article = $\sf{\dfrac{360}{15}}$

= Rs 24

So, the price of 21 such articles

= 21 x 24

= Rs 504

∴ The price of 21 articles is Rs 504.

Question 2:

Distance travelled by the car is 4 hours = 180 km

∴ The distance travelled by the car in 1 hour = $\sf{\dfrac{180}{4}}$

= 45 km/hr

We know that:

$\sf{Time=\dfrac{Distance}{Speed}}$

Therefore, the time taken to cover a distance of 400 km =

$\sf{Time=\dfrac{400}{45}}$

Time = 8.8 hours

∴ The car takes 8.8 hours to cover a distance of 400 km.