3/5 x 5/12 x 4/15 = 3 x 5 x 4/5 x 12 x 15
= 5 x (3 x 4)/5 x 12 x 15
= 1/15
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(15 + 1/3) x 12 = 184
Yes, you can, because 15 goes into 15 once and 60 4 times, so it is simplified to 1 over 4. If you don't know your 15 times table, or cannot see 15 in 15 over 60, you can use 5 - 5 goes into 15 3 times and 5 goes into 60 12 times, so it is 3 over 12, whih can be simplified by dividing by 3. 3 goes into 3 once and 3 goes into 12 4 times so it is 1 over 4.
4/15 * 9/5 = 4/5 * 3/5 = 12/25
4/12 + 3/15 = 4x1/4x3 + 3/15 = 1/3 + 3/15 = 1x5/3x5 + 3/15 = 5/15 + 3/15 = 8/15
It is: 15/19 times 8/3 = 40/19