點做ar?F.2 Maths:
For two consecutive multiples of 3,5 times the larger number is not less than 2 times the smaller number plus 45.Find the minimum values of these two numbers. Please help me!~
點做ar?F.2 Maths
2007-01-12 2:25 am
回答 (2)
2007-01-16 1:42 am
✔ 最佳答案
Let 3n be the larger number. (n is a positive integer)Then 3(n-1) will be the smaller number; and
5(3n) >= 2*3(n-1)+45
15n >= 6n - 6 + 45
9n >= 39
n >= 4.333333
Therefore, the minimum value of n is 5;
And the numbers will be 15 and 12.
2007-01-12 2:30 am
5x >= 2(x-1)+45
ans. 15,18
ans. 15,18
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