$\frac{ 24 \times 4 \times 15 }{ 5 \times 8 \times 12 }$
Cancel out the common factor $8$$\frac{ 3 \times 4 \times 15 }{ 5 \times 12 }$
Cancel out the common factor $5$$\frac{ 3 \times 4 \times 3 }{ 12 }$
Cancel out the common factor $4$$\frac{ 3 \times 3 }{ 3 }$
Cancel out the common factor $3$$3$