Number one: A B D E
number two:C
if any of these are wrong let me know ;) thank you
The answer is 10/3
The explanation 2 1/3 cu of flour/ 3 1/2 dozen of cookies = X unknown cu. of flour/ 5 dozen cookies
Cross multiply
3 1/2 X = 5 (2 1/3) Change the mixed numbers into improper.
7/2 X = 5 ( 7/3) Solve for "X." Multiply both sides of equation by reciprocal of 7/2, which is 2/7
(2/7 (7/2)X = 5 (7/3)(2/7) X= 10/3 =Just divide 10 by 3. You should get a whole number
(3b) / (5b - 7) = 8/11
cross multiply
8(5b - 7) = 11(3b)
40b - 56 = 33b
-56 = 33b - 40b
-56 = -7b
-56/-7 = b
8 = b
The least common multiple of 3 and 7 is 21
3,6,9,12,15,18,21
7,14,21
A = 54 + 5t
A = 84 + 2t
54 + 5t = 84 + 2t
5t - 2t = 84 - 54
3t = 30
t = 30/3
t = 10....they will reach the same investment in 10 years
