DONALD+GERALD=ROBERT Given 'D=5' (If not given assume D=5 at initial stage)…
2024
DONALD+GERALD=ROBERT
Given 'D=5' (If not given assume D=5 at initial stage) What is T*B
- A.
0
- B.
16
- C.
12
- D.
8
Attempted by 4 students.
Show answer & explanation
Correct answer: A
Key insight: use the units column to determine T.
Units column: D + D = T (mod 10). Given D = 5, compute 5 + 5 = 10, so T = 0 and there is a carry of 1 to the next column.
Since T = 0, the product T × B = 0 regardless of the digit assigned to B.
Therefore the requested value T × B is 0.
Answer: 0