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Mathematics 294
You have to spend 16 1 yuan to buy three footballs and two basketballs.

It shows that it costs 16 1*2=322 yuan to buy 6 soccer balls and 4 basketball balls.

It costs 294 yuan to buy 6 footballs and 3 basketballs.

So the unit price of basketball

=322-294

=28 yuan

therefore

You have to pay for two basketballs.

28*2

=56 yuan

therefore

You have to pay for three footballs.

16 1-56

= 105 yuan

therefore

Unit price of football

= 105/3

=35 yuan

therefore

You need to pay 10 football and 5 basketballs.

35* 10+28*5

=350+ 140

=490 yuan