There are 200 students in the school choir. Twenty percent of them are in third grade and of them are in sixth grade. How many choir students are not in
third or sixth grade?

There are 200 students in the school choir. Twenty percent of them are in third grade and of them are in sixth grade.

⇒ choir students are not in third or sixth grade: 100% - 20% = 80%

⇒ choir students are not in third or sixth grade :

    200 × 80% = 160 (students)

160 students

OK done.Thank to me :>

26

step-by-step explanation:

option a, c,d are correct.

step-by-step explanation:

from the given figure, it is given that z is equidistant from the sides of the triangle rst, then from triangle tzb and triangle szb, we have

tz=sz(given)

bz=zb(common)

therefore, by rhs rule,δtzb ≅δszb

by cpctc, sz≅tz

also, from δctz and δasz,

tz=sz(given)

∠tcz=∠saz(90°)

by rhs rule, δctz ≅ δasz, therefore by cpctc, ∠ctz≅∠asz

also,from δasz and δzsb,

zs=sz(common)

∠zbs=∠saz=90°

by rhs rule, δasz ≅δzsb, therefore, by cpctc, ∠asz≅∠zsb

hence, option a, c,d are correct.