Concept:Expanding a number in powers of 10 shows each digit's place value.
Explanation:Write 4003250 in expanded form by place value.
4 is in the ten-lakhs place, so 4 × 10
6.
0 is in lakhs place, skip.
0 in ten-thousands, skip.
3 in thousands place gives 3 × 10
3.
2 in hundreds place gives 2 × 10
2.
5 in tens place gives 5 × 10
1.
0 in units, ignore.
So, 4003250 = 4×10
6 + 3×10
3 + 2×10
2 + 5×10
1.
Comparing with given expression: x=6, y=3, z=2, w=1.
Sum = 6+3+2+1 = 12.
Answer:C. 12