Missing number problem
A number is multiplied by 4 and then 7 is added. The result is three times the original number plus 19.
What is the 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 number be x
ReplyDelete4x + 7 = 3x + 19
Subtract 3x from both sides:
x + 7 = 19
Subtract 7 from both sides:
x = 12
Final Answer:
The number is 12
Check:
4 × 12 + 7 = 48 + 7 = 55
3 × 12 + 19 = 36 + 19 = 55
Both sides are equal, so the answer is correct.