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Mathematics prize
Solution: If there are x pens, there are 2x notebooks. Small notebook y; According to the meaning of the question

5y+ 10x+7×2x = 346;

That is 5y+24x = 346;;

y = 69-4x+( 1-4x)/5;

Because x and y are natural numbers;

So x can only be: 4,9, 14,19,24, ...

The corresponding values of y are: 60, 26, 2, -32. ....

So the values of x and y are: 4,60,9,26,14,2.

In order to maximize the quantity,

Therefore, x = 4;;

? y = 60

Buy pens: 4;

Buy a big notebook: 4×2=8,

Small notebook: 60,