15-(-5)=
And
20-(-12)=

15-(-5)=20

20-(-12)=32

Step-by-step explanation:

1st Problem: 20   2nd Problem: 32

Step-by-step explanation:

When you have two negatives right next to each other, they turn into positives. So, you add instead of subtract.

15 + 5 = 20

20 + 12 = 32

distance covered by pamela in 9 l of fuel = 99km

let us apply unitary method here.

distance covered by pamela in 1 l of fuel =99/9 =11 km

now let us find distance covered by pamela if she has 12 l of fuel.

distance covered in 12 l = distance covered in 1 l of fuel * 12

we know that distance covered by here in 1 l is 11 km.

so distance covered in 12 l of fuel = 11*12 = 132 km.

this is false ^.^ lol