Ratio of girls to boys = 5/3
Number of girls in 40 students would be 3/5 * 40 = 24
3p - 7 + p = 13
3p + p = 13 + 7
4p = 20
p = 20 : 4
p = 5
Answer:
z = 18
x = 26 and y = 16
Step-by-step explanation:
Given:


Rewrite
to make
the subject:

Substitute this into
:

Cross multiply:




Substitute found value of x into
and solve for y:


Substitute found value of y into
and solve for z:
