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If y + 3y + 10 = 70, then 4y + 10 = 70, and 4y = 60. We then find that y = 60/4 = 15.
70 + 70 + 50 + 50 = 240
Well, 10% of 70 would be 7. So if I am understanding the question correctly, I would have70+(10% of 70) -> 70+(.1*70) -> 70+(7)70+7=77
63/70 = 9/10
10 + 3mm = 2010 + 3x20 = 70