80. If the value of X and Y in the fraction XZN are both tripled, how does the value of the fraction change? Increases by half? Remains the same? Triples? Decreases by half?

Remains the same

Step-by-step explanation:

Given

Required

What happens when the X and Y are tripled;

When both X and Y are tripled, the new fraction is represented below:

When the numerator and denominator are divided by their common factor (3), the new fraction becomes

Compare the new fraction with the initial fraction; one would notice that they have the same value;

Hence, the fraction remains the same

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.