The ratio of the number of boys to the number of girls at a school is 4: 5. if there are 120 boys, how many students are there altogether?

a.) 53
b.) 96
c.) 150
d.) 270

270 students

Step-by-step explanation:

There are more boys than girls, as the ratio of boys to girls is 4:5.

Write and solve an equation of ratios:

   4           5

=

 120          g

... where g is the number of girls.  Cross multiplying, we get:

4g = 600, so that g must be 150.

120 boys plus 150 girls comes to 270 students (Answer d)

f(2x−x2)=−3x2+6x−1

step-by-step explanation:

set up the composite function and evaluate.

f(2x−x2)=−3x2+6x−1

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