Explanation:
I just answered this. how often did you post it ?
for more details see my other answer.
a ratio is a special fraction.
it is a simplified form of the rehab of both fractions of both types of items in the bag.
the sum of numerator and denominator gives us a relative number of coin units.
each unit has the exact same number of coins (but only of the corresponding type).
99 + 55 = 154 coin units.
1.
so, the fraction of coins being dimes is 55/154.
the fraction of coins being quarters is 99/154.
2.
55 × f = 99
f = 99/55 = 1.8
so, there are 1.8 times more quarters in the bag than dimes