Question 1
Editorial self-study SET for 2027; not an official SASMO 2027 examination. Known source years remain in individual attributions. Time: 90 minutes. Platform scoring starts at 0: Q1–15 are worth 2 points each; Q16–25 are worth 4 points each; wrong and blank answers score 0; maximum 70. Official SASMO scoring instead starts at 15, deducts 1 for an incorrect Section A answer and has a maximum of 85. Verified means editorially checked; assumptions, source errors and mathematical uncertainty are disclosed where relevant.
ABCD is a four-digit number. Its digits satisfy A = 4 × D, A + B = C + D, and A − C = 2. Find the number ABCD.
ABCD is a four-digit number. Its digits satisfy A = 4 × D, A + B = C + D, and A − C = 2. Find the number ABCD.