Mrs Rama uses 0.4 liters of watermelon juice for every 0.9 liters of apple juice to make a jug of mixed fruit juice.

a) for 225 ml of apple juice,how much watermelon juice should Mrs Rama use?
b) if Mrs Rama uses 80 ml of watermelon juice,how much apple juice does she
need?

I just did 2 questions for you that are very similar to this one.

I want you to try this one, using the same method I just used.
Let me know what you got.

To solve both of these questions, we need to use the given ratio of 0.4 liters of watermelon juice for every 0.9 liters of apple juice.

a) For 225 ml of apple juice, we need to determine the corresponding amount of watermelon juice that Mrs Rama should use.

First, let's convert the given measurements to liters:
225 ml = 225/1000 = 0.225 liters

Now, we can set up a proportion using the given ratio:
0.4 liters of watermelon juice / 0.9 liters of apple juice = x liters of watermelon juice / 0.225 liters of apple juice

Cross multiplying, we get:
0.4 * 0.225 = 0.9 * x

Simplifying this equation gives us:
0.09 = 0.9x

To isolate x, divide both sides of the equation by 0.9:
x = 0.09 / 0.9
x = 0.1

Therefore, Mrs Rama should use 0.1 liters (or 100 ml) of watermelon juice for 225 ml of apple juice.

b) Now let's determine the amount of apple juice needed when Mrs Rama uses 80 ml of watermelon juice.

Again, we'll convert the measurements to liters:
80 ml = 80/1000 = 0.08 liters

Setting up a proportion using the given ratio:
0.4 liters of watermelon juice / 0.9 liters of apple juice = 0.08 liters of watermelon juice / x liters of apple juice

Cross multiplying, we have:
0.4 * x = 0.08 * 0.9

Simplifying this equation gives us:
0.4x = 0.072

To solve for x, divide both sides of the equation by 0.4:
x = 0.072 / 0.4
x = 0.18

Therefore, Mrs Rama would need 0.18 liters (or 180 ml) of apple juice when using 80 ml of watermelon juice.

1+1=2