exam Maths Puzzle Numerical Ability

thirty percent of the sulfur desiccated. If 42 tons did not desiccate, how much sulfur was there in all?

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I am now stuck on the factoring by group.

45x^2 + 39x + 6

I wish math came easier to me! I think I have some of it just not to sure
3(15x^2 + 13x + 2) Solve the system by substitution.
x + 2y = –17
–2x + 3y = –15
Solve the system by addition.
–2x + 5y = –19
x – 3y = 10