What's the number
A number is tripled, then 4 is added to the result. The final answer is 25. What was the original number?
Word Problem
A bridge is built across a river. One quarter of the bridge is over the left bank of the river and one third of the bridge is over the right bank. The river is 120 m wide. How long is the bridge?
Let the original number be x.
ReplyDeleteAccording to the problem:
The number is tripled: 3x
Then 4 is added: 3x + 4
The final result is 25:
3x + 4 = 25
To find x, solve the equation:
Subtract 4 from both sides:
3x = 25 - 4
3x = 21
Divide by 3:
x = 21 ÷ 3 = 7
Final Answer:
The original number was 7.