The task is to generate the correct answer for a given math problem.

[Q]: Problem: 475.124 x 15.98 ÷ 8.001 + 33.33 = ?
[A]: 983.578


[Q]: Problem: if 4 xz + yw = 10 and xw + yz = 20 , what is the value of the expression ( 2 x + y ) ( 2 z + w ) ?
[A]: 50 .


[Q]: Problem: if x , y , and z are positive integers and 3 x = 4 y = 7 z , then the least possible value of x - y + z is
[A]:
19