Question

in rohans birthday party 90% of his friends came and three friends didn't come. find the total number of friends rohan has.​

Answer 1

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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.

Answer 2

Answer:

Let total no. of friends be x.

Percentage of friends who came = 90%

Percentage of friends who didn't go = 100% - 90% = 10%

No. of friends who didn't go = 3

Thus, 10 % of x = 3

10x/100 = 3

x/10 = 3

x = 30

OR

100% ( total friends ) = 10%*10 = 3*10 = 30

Therefore, Rohan had 30 friends.