Question

15 x 24 + 48 x 54 - 23 x 24.

Answer 1

\(=15\cdot24+2\cdot24\cdot54-23\cdot24=15\cdot24+24\cdot108-23\cdot24=24\cdot\left(15+108-23\right)=24\cdot100=2400\)

Answer 2

`15 xx 24 + 48 xx 54 - 23 xx 24`

`= 15 xx 24 + 2 xx 24 xx 54 -23 xx 24`

`= 15 xx 24 + 24 xx 108 - 23 xx 24`

`= 24 xx (15 + 108 -23)`

`= 24 xx 100`

`= 2400`