3/5 ÷ 4/15
3/5 * 15/4
45/20
9/4■
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(3/7)/(15/2)=(3/7) times (2/15) = 6/105 = 2/35
15/35 = 3/7
3/4
To simplify a fraction, you need to identify any common divisors between the numerator and denominator. In this case, both 45 and 15 can divide by 15. Do this and we get 3/1. Any number divided by 1 gives itself. Thus 45/15 can be simplified to 3.
3/5 & 4/15 are already simplified.