220/400 = 55%
100%- 55% = 45%
there were 45% more girls than there were boys.
Can i have brainliest hehehe......
Answer:
Step-by-step explanation:

Answer:
100
Step-by-step explanation:
Let x be the amount to be added of the second solution. For every 100ml of it 8 units of minoxidil are added. The total amount of solution will be (100 + x), so the final concentration is given by:
[Multiplying by (100 + x)]
[Transposing terms]
[
operating]
[Dividing by 0.02]
