Alice thinks of four positive integers $a\leq b\leq c\leq d$ satisfying $\{ab+cd,ac+bd,ad+bc\}=\{40,70,100\}$. What are all the possible tuples $(a,b,c,d)$ that Alice could be thinking of?
1. Given the conditions \( \{ab+cd, ac+bd, ad+bc\} = \{40, 70, 100\} \), we assume \( ab+cd \geq ac+bd \geq ad+bc \). Therefore, we assign:
   \[
   ab+cd = 100, \quad ac+bd = 70, \quad ad+bc = 40
   \]

2. We add the equations pairwise:
   \[
   (a+d)(b+c) = (ab + ad + bc + cd) = 100 + 70 = 170
   \]
   \[
   (a+c)(b+d) = (ab + ac + bd + cd) = 100 + 40 = 140
   \]
   \[
   (a+b)(c+d) = (ab + ac + bd + bc) = 70 + 40 = 110
   \]

3. We now have the system of equations:
   \[
   (a+d)(b+c) = 170
   \]
   \[
   (a+c)(b+d) = 140
   \]
   \[
   (a+b)(c+d) = 110
   \]

4. We observe the inequalities \( a+b \leq a+c \leq a+d \) and \( b+c \leq b+d \leq c+d \). We also note that \( a+b \leq c+d \) and \( a+c \leq b+d \).

5. To solve for \( a, b, c, d \), we need to find values that satisfy these equations. We start by setting:
   \[
   a+b = 5, \quad c+d = 22
   \]
   \[
   a+c = 7, \quad b+d = 20
   \]

6. From \( a+c = 7 \) and \( a+b = 5 \), we subtract to find:
   \[
   c - b = 2
   \]

7. Since \( b+c \) must be even for \( c \) to be an integer, we set:
   \[
   b+c = 10
   \]

8. We now solve for \( a, b, c, d \):
   \[
   a+d = 17
   \]

9. Solving the system of linear equations:
   \[
   a + b = 5
   \]
   \[
   a + c = 7
   \]
   \[
   b + c = 10
   \]
   \[
   c + d = 22
   \]
   \[
   b + d = 20
   \]
   \[
   a + d = 17
   \]

10. From \( a + b = 5 \) and \( a + c = 7 \), we get:
    \[
    c - b = 2
    \]

11. From \( b + c = 10 \), we solve for \( b \) and \( c \):
    \[
    b + (b + 2) = 10 \implies 2b + 2 = 10 \implies 2b = 8 \implies b = 4
    \]
    \[
    c = b + 2 = 4 + 2 = 6
    \]

12. From \( a + b = 5 \), we solve for \( a \):
    \[
    a + 4 = 5 \implies a = 1
    \]

13. From \( c + d = 22 \), we solve for \( d \):
    \[
    6 + d = 22 \implies d = 16
    \]

14. We verify the solution:
    \[
    ab + cd = 1 \cdot 4 + 6 \cdot 16 = 4 + 96 = 100
    \]
    \[
    ac + bd = 1 \cdot 6 + 4 \cdot 16 = 6 + 64 = 70
    \]
    \[
    ad + bc = 1 \cdot 16 + 4 \cdot 6 = 16 + 24 = 40
    \]

Thus, the only solution is \(\boxed{(1, 4, 6, 16)}\).