Answer:
Step-by-step explanation:
Let
x-----> the number of girls
y-----> the number of boys
we know that
-----> equation A
isolate the variable y
-----> equation B
Substitute equation B in equation A
Answer:
17
Step-by-step explanation:
2x + 5 + 3x + 90 = 180, 5x=85, x=17
25=5-10w
25-5=20
20/-10w
W=-2
Each one had 1/8 litre
because she had 1/4 out of 1 left so she used 3/4 litre to fill 6 glasses
3/4 ÷6 = 1/8