In mrs. hu’s classroom, 4/5 of the students have a dog as a pet. of the students who have a dog as a pet, 2/3 have a cat as a pet. if there are 45 students in her class, how many have both a dog and a cat as pets?

21 students have both a dog and a cat as pets.

Step-by-step explanation:

Total students in the class = 45

Fraction of students having dog as a pet =

Number of students having dos as  a pet ,D=

Fraction of students having dog as a cat as a pet=

Number of students having dos as a pet ,C=

Students having both cat and dog as a pet = D∪C

D∪C  = 45

D∪C = D + C - D∩C

45 = 36+ 30 - D∩C

D∩C = 66 - 45 = 21

21 students have both a dog and a cat as pets.

the 4th choice is the correct one

step-by-step explanation:

the answer is 5/14.

hope this .