Select three ratios that are equivalent to 8:5

16 and 10 are both divisible by 2. 2*8=16 and 2*5=10. So this one works.
48 and 30 are both divisible by 6. 6*8=48 and 6*5=30. So this one works.
32 and 20 are both divisible by 4. 4*8=32 and 4*5=20. So this one works.
Another way to think about it is if you put them as fractions and reduced them down to their simplest form, they would form the fraction 8/5.
16/10: divide each by 2 to get 8/5.
48/30: divide each by 6 to get 8/5.
32/20: divide each by 4 to get 8/5.

If jon had $4.00 then takes away $2.25, then he should have $1.75 left. $4.00 - $2.25 = $1.75 hope this ; )