Step-by-step explanation:
Given that,
The area of a blackboard is 
The area of poster is 
We need to find the unit rate of the blackboard's area to the poster's area. So, it can be calcualted by dividing blackboard's area to the poster's area.
So,
So, the rate of 
.
Answer:
the first one
the third one
and the forth one
Step-by-step explanation:
they all add up to the same amount
I=prt so you multiply principal rate and time to get the answer
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problems fast
Answer:
240, 1800, 2040
Step-by-step explanation:
First find the surface area of the shape - base = 3 x 15 x 2 + 40 x 15 + 40 x 3 x 2 = 930 m ^2
Now find the area of base = 40 x 15 = 600
Now, the cost of painting = 10 pounds for 25 m^2. SO here cost = 600 / 25 x 10 = 24 x 10 = 240 pounds.
Now cost of tiles = 600 x 3 = 1800
Total cost = 1800 +240 = 2040
