Show your working steps clearly.
1.The value of a is 4 times that of b.If their sum is 45, find the value of a.
2.If the sum oftwo consecutive even no. is 46, find the values of these two no. .
3.Edward divides 60 marbles into two groups. If 7 times the number of marbles in the smaller group is equal to 3 times that in the lager goup,find the no. of mables in the smaller group.
F.1 maths questions
2007-11-22 2:30 am
回答 (2)
2007-11-22 2:51 am
✔ 最佳答案
1. a = 4b ------1a+b = 45-----2
From (1),
b = a/4---------3
Sub(3)into(2)
a + (a/4) = 45
a(1/1/4) = 45
a = 36
2. let the two consecutive even no. be x, (x+2)
x + (x+2) = 46
2x +2 = 46
2x = 44
x = 22
Therefore, the two consecutive even no. is 22 and (22+2) = 24
3. let the no. of marbles in a smaller and a larger groups be x and y resp.
x + y = 60-----------1
7x = 3y---------------2
From (1),
y = 60-x-------------------3
Sub(3)into(2)
7x = 3(60-x)
7x = 180 - 3x
10x = 180
x = 18
therefore, the no. of marbles in the smaller group is 18
2007-11-22 2:50 am
1.
1)a=4b b=a/4
2)a+b=45
2)a+a/4=45
4a+a=180
a=36
2.
Let the smaller no. be X and the larger no. be X+2
X+(X+2)=46
X+X+2=46
X=22
3.
Let the no. of mables in smaller group be X
7X=3(60-X)
7X=180-3X
10X=180
X=18
1)a=4b b=a/4
2)a+b=45
2)a+a/4=45
4a+a=180
a=36
2.
Let the smaller no. be X and the larger no. be X+2
X+(X+2)=46
X+X+2=46
X=22
3.
Let the no. of mables in smaller group be X
7X=3(60-X)
7X=180-3X
10X=180
X=18
參考: ME
收錄日期: 2021-04-13 14:32:43
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