Answer:
Answers are in the explanation.
Step-by-step explanation:
A solution is the mixture of 2 or more substances in which the substance in less amount is the solute and the substance must abundant is the solvent.
The more soluble solute is the one that can be dissolved in the biggest amount. As there are dissolved 10g of sugar and 5g of salt, the more soluble is sugar
Normally, the solutes are more solubles when the temperature increases. If you can't dissolve a solute, you can try heat it and probably it would be dissolved.