Question

Could you answer the question number b​

Answer 1

Answer:

450 - 120 - 80

=250

2/5 × 250 = 100. A

3/5 × 250 = 120 B

Answer 2

Answer:

Grade A   2:9

Grade B   1:3

Grade C  4:15

Step-by-step explanation:

Students in grade A:

$450-(120+80)=450-200=250$

if the ratio is 2:3 then

$A=(250/5)(2)=(50)(2)=100$ students

The ratio of students with grade A:

$\frac{100}{450}=\frac{10}{45} =\frac{2}{9}$

= $2:9$

Students with grade B.

$B=250-100=150$

The ratio of B:

$\frac{150}{450} =\frac{15}{45} =\frac{1}{3}$

$= 1:3$

Ratio of students with grade C:

$=\frac{120}{450} =\frac{12}{45} =\frac{4}{15}$

$=4:15$

Hope this helps