Chapter 3 - Section 3.3 - Systems of Linear Equations in Three Variables - Exercise Set - Page 219: 66

30 cm

The three variables are: t= table height (which in images is reduced by block length or width) w=wooden block width l=wooden block length First image: $l+t-w=32$ Second image: $w+t-l=28$ Set up system of equations: $l+t-w=32$ $w+t-l=28$ Simply add the two equations: $2t=60$ $t=30$