Work out the number
I am thinking of a number.
If I multiply the number by 3 and then subtract 7, the result is the same as subtracting 5 from twice 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.
ReplyDeleteAccording to the question:
3x − 7 = 2x − 5
Now solve the equation:
Step 1: Subtract 2x from both sides:
3x − 2x − 7 = −5
x − 7 = −5
Step 2: Add 7 to both sides:
x = −5 + 7
x = 2