1.Which ratios form a proportion
A.3/15,12/55 B.8/24,12/35 C.5/18,25/90D.4/11,16/25
2.Which ratio forms a proportion with 9/15
A.6/10B.16/21C.36/50D.45/70
OH i know its A
in 10 is 66% of 15
and 6 is 66% of 9
ok thx see ya
i think d
no sry im not good at math
AT ALL. ill try again
issac is wrong mrs sue is right
Which pair of ratios forms a proportion?
A. 5/12,7/15
B. 12/16,15/20
C. 8/32,1/3
D. 9/16,3/8
To determine which ratios form a proportion, we need to check if the cross products of the ratios are equal.
1. For the first question, let's check each option:
A. 3/15 and 12/55
To find the cross products, we multiply the numerator of the first ratio (3) with the denominator of the second ratio (55):
3 * 55 = 165
Next, we multiply the numerator of the second ratio (12) with the denominator of the first ratio (15):
12 * 15 = 180
As the cross products do not match (165 ≠ 180), option A does not form a proportion.
B. 8/24 and 12/35
Cross products:
8 * 35 = 280
12 * 24 = 288
The cross products do not match (280 ≠ 288), so option B does not form a proportion.
C. 5/18 and 25/90
Cross products:
5 * 90 = 450
25 * 18 = 450
The cross products match (450 = 450), so option C forms a proportion.
D. 4/11 and 16/25
Cross products:
4 * 25 = 100
16 * 11 = 176
The cross products do not match (100 ≠ 176), so option D does not form a proportion.
Therefore, the correct answer is option C.
2. For the second question, we need to find the ratio that forms a proportion with 9/15.
Check each option:
A. 6/10
Cross products:
9 * 10 = 90
6 * 15 = 90
The cross products match (90 = 90), so option A forms a proportion.
B. 16/21
Cross products:
9 * 21 = 189
16 * 15 = 240
The cross products do not match (189 ≠ 240), so option B does not form a proportion.
C. 36/50
Cross products:
9 * 50 = 450
36 * 15 = 540
The cross products do not match (450 ≠ 540), so option C does not form a proportion.
D. 45/70
Cross products:
9 * 70 = 630
45 * 15 = 675
The cross products do not match (630 ≠ 675), so option D does not form a proportion.
Therefore, the correct answer is option A.
Right!
See -- you're not so bad at math. You remembered the way to solve this problem.
Why do you think D?
Does 9/15 = 45/70?
A.3/15,12/55 No. 55 is not divisible by 15.
B.8/24,12/35 No
C.5/18,25/90 Yes. 25/90 = 5/18
D.4/11,16/25 No.
If you try to solve the other problem, I'll be glad to check it.