1. We assume, that the number 200 is 100% - because it's the output value of the task. 2. We assume, that x is the value we are looking for. 3. If 200 is 100%, so we can write it down as 200=100%. 4. We know, that x is 28% of the output value, so we can write it down as x=28%. 5. Now we have two simple equations: 1) 200=100% 2) x=28% where left sides of both of them have the same units, and both right sides have the same units, so we can do something like that: 200/x=100%/28% 6. Now we just have to solve the simple equation, and we will get the solution we are looking for.
7. Solution for what is 28% of 200
<span>x=56 </span> so <span>now we have: </span> <span>28% of 200=56</span>
The answer is B because in total you there are 15 bicycles and tricycles so b +t =15 Bicycles have 2 wheels and tricycles have 3 wheels so 2b + 3t = 45