Jawaban:

1. Ali has 12 friends coming over for supper, and he will also be eating. So in total, there will be 13 people eating. He needs 150g of rice per person, so the total amount of rice needed is:

150g/person x 13 people = 1,950g

Therefore, Ali needs 1,950 grams of rice for the supper.

2. Steffi needs 3 litres of white paint for every 2 litres of red paint. Let's call the amount of white paint she needs "w" and the amount of red paint she needs "r". We can set up a ratio:

white paint : red paint = 3 : 2

We know that the total amount of paint needed is 40 litres. So we can set up another ratio using this information:

white paint + red paint = 40 litres

To solve for the unknowns, we can use algebra. First, we can set up an equation based on the first ratio:

w/r = 3/2

We can simplify this equation by cross-multiplying:

2w = 3r

Next, we can use the second ratio to set up another equation:

w + r = 40

Now we can substitute the first equation into the second equation:

(2/3)r + r = 40

Multiplying both sides by 3 to get rid of the fraction, we get:

2r + 3r = 120

5r = 120

r = 24

So Steffi needs 24 litres of red paint. We can use the first equation to find the amount of white paint:

2w = 3r

2w = 3(24)

2w = 72

w = 36

Therefore, Steffi needs 36 litres of white paint and 24 litres of red paint.

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