I have a hunch Soroban is doing q1.

I'll let you contemplate where the following two equations come from that you must solve simultaneously:

100 = x + 2y .... (1)

1120 = 10x + 23y .... (2)

I get 40 kg each of the two higher priced teas and 20 kg of the lowest priced tea in the 100 kg of tea. Therefore .....