exam Maths Puzzle Numerical Ability

In 1985, the Lincoln Memorial was 1 1/2 times as old as the Jefferson Memorial. If the Lincoln Memorial was built 21 years before the Jefferson Memorial, give the year each memorial was built.

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Hi,

My brother is 13, and just want to query this question.

9y - 3y = 6y.

Is this correct? or does it subtract the y aswell meaning the answer would be:

9y - 3y = 6.

Thanks!! i have a couple here for you and i do not understand any of these. If you can please show these step by step answers..
1)-11< x-5 less than or equal to 8

2)-10 greater than o