Question

7. In Rohan's birthday party, 90% of his friends came and three friends did not come. Find
the total number of friends Rohan has.​

Answer 1

Answer:

30

Step-by-step explanation:

Friends came=90%

Friends didn't came=3

Let the number of Friends came be x,

Friends didn't came in %=(100-90)%

=10%

10% of x=3

10x/100=3

x=100×3/10

=300/10

=30

Hope this helps you mate

Answer 2

Answer:

Rohan has 30 friends.

Step-by-step explanation:

Given:

Friends came = 90% of total friends

Friends who didn't come = 3

To find :

Total number of friends Rohan has

Solution :

Let the total number be y.

As 90% came,

⇒ 100 - 90

⇒ 10%

10% didn't come

It is also given that 3 friends didn't come.

⇒ 10% of y = 3

⇒ 10/100 × y = 3

⇒ 10y = 3 × 100

⇒ 10y = 300

⇒ y = 300/10

⇒ y = 30

Total Friends = 30

Friends who attended the party -

⇒ 90% of 30

⇒ 90/100 × 30

⇒ 9/10 × 30

⇒ 9 × 3

⇒ 27

27 friends attended the party.

Therefore, Rohan has 30 friends.