I had one that would calculate the value at the coordinates of an arbitrarily large triangle of numbers like this
7
4 8
2 5 9
1 3 6 10
and they give you a coordinate like (3,2) and you need to answer 9.
theres a lot of different ways to solve, all pretty much revolving around series summing (the 4th number on the bottom row is 10 because its 4+3+2+1, etc). You can then use the diagonal run to get the coordinate value, based on the bottom row value.
I had one that would calculate the value at the coordinates of an arbitrarily large triangle of numbers like this
7 4 8 2 5 9 1 3 6 10
and they give you a coordinate like (3,2) and you need to answer 9.
theres a lot of different ways to solve, all pretty much revolving around series summing (the 4th number on the bottom row is 10 because its 4+3+2+1, etc). You can then use the diagonal run to get the coordinate value, based on the bottom row value.