A minibus has 18 l of fuel left. After refuelling, the fuel meter indicates 65 l. How much fuel has been filled in the fuel tank of the minibus?
Given: Initial fuel = 18 litres Final fuel = 65 litres
Formula: Fuel filled = Final fuel - Initial fuel
Substitution: Fuel filled = 65 - 18
Calculation: Step 1: Subtract ones: 5 - 8 cannot be done, borrow 1 ten = 10 ones 15 - 8 = 7 Step 2: Subtract tens: 5 - 1 = 4 Result = 47
Answer: 47 litres of fuel has been filled in the fuel tank.
Explanation
The chapter explains subtraction using place value. To find how much fuel was added, we subtract the initial amount from the final amount: 65 - 18 = 47 litres.
Solution Steps
Step 1: Identify what we need to find: fuel filled = final - initial
Step 2: Set up subtraction: 65 - 18
Step 3: Subtract ones: 5 - 8 cannot be done, so borrow 1 ten = 10 ones. 15 - 8 = 7
Step 4: Subtract tens: 5 (after borrowing) - 1 = 4
Step 5: Answer: 47 litres