Answer:
A) The width is 12 cm; the average time is 3 minutes
Step-by-step explanation:

Cross multiply.
5 × y = 3 × 20
5y = 60
5y ÷ 5 = 60 ÷ 5
y = 12
The width is 12 cm. Moving onto the time.

Cross multiply.
4 × y = 12 × 1
4y = 12
4y ÷ 4 = 12 ÷ 4
y = 3
The time is 3 minutes.
10 x 10 = 100
Ten ten dollar bills = one hundred dollars
Answer:
12/5%
Step-by-step explanation:
12/5 %
that's it cuz u can't divide them
A suitable calculator can row-reduce the augmented matrix.
first number: 3
second number: 1
third number: 8