This isn't too tough because the possibilities are few.
The multiples of 7 between 20 and 80 are:
21, 28, 35, 42, 49, 56, 63, 70, and 77.
Of these, when you add 1 ("next year") only one of them becomes a multiple of 5:
49 + 1 = 50
So my age this year is 49. 6 years from now I'll be 55.
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52 × 6 = 312 Therefore, 6 years is more than 300 weeks. Note: there are 52 weeks in a year.
That depends on what you are rounding to. 8.6 rounded to the nearest tenth (or less) is 8.6; to the nearest integer is 9; to the nearest multiple of 10 is 10; to the nearest multiple of 100 (or more) is 0.
Yes
-3
The Least Common Multiple (LCM) of 30 is 30. The LCM is the smallest multiple that two or more numbers have in common. In the case of 30, it is already the smallest multiple of itself, so the LCM of 30 is 30.