Question

35 children of a class draws worldmap 26 uses blue colour and some uses green colour if 19 uses both colour and each student uses at least one colour find the number of childrens who uses the green colour

Answer 1

Answer:

28

Step-by-step explanation:

number of children using green colour are 28

Answer 2

Given:

35 children of a class draw a world map. 26 uses blue colour and some uses green colour. 19 uses both colours and each student uses at least one colour.

To find:

The number of children who uses the green colour.

Solution:

The number of children who uses the green colour is 28.

To answer this question, we will follow the following steps:

As given, we have,

The number of children who use blue colour or n(A) = 26

Let the number of children who uses green colour be n(B).

Also given,

The number of children who use both blue and green colour or n(A ∩ B) = 19

The number of children who use blue colour or green colour = n(A ∪ B) = 35

Now,

we know that

n(A ∪ B) = n(A) + n(B) - n(A ∩ B)

So,

35 = 26 + n(B) - 19

35 = 7 + n(B)

n(B) = 28

Hence, the number of children who uses the green colour is 28.