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NCERT Solutions for Class 5th Maths Chapter 8 Kiran's petrol pump, and Sam and Tina's bikes — Let Us Compare

Book page 115–117 Updated on2026-09-19

Q1.
Kiran owns a petrol pump. She records the details of the sales of petrol in a day. Complete the “Total Quantity of Fuel (in litres)” column. Truck — 3 vehicles, 500 l each. Bus — 6 vehicles, 300 l each. Car — 10 vehicles, 50 l each. Auto Rickshaw — 12 vehicles, 8 l each. Two-wheeler — 25 vehicles, 5 l each.
Answer

Truck 1,500 l · Bus 1,800 l · Car 500 l · Auto Rickshaw 96 l · Two-wheeler 125 l.

  1. For each row, ask: how many vehicles, and how much fuel in each?
  2. Multiply the number of vehicles by the fuel in one vehicle.
  3. Write the unit — litres.
VehicleNo. of VehiclesQuantity of Fuel in Each Vehicle (in litres)WorkingTotal Quantity of Fuel (in litres)
Truck35003 × 5001,500 l
Bus63006 × 3001,800 l
Car105010 × 50500 l
Auto Rickshaw12812 × 896 l
Two-wheeler25525 × 5125 l
Notice something interesting: there are only 3 trucks but 25 two-wheelers, and yet the trucks take twelve times more fuel. A big vehicle drinks a lot in one go. The number of vehicles alone does not tell you the fuel.
Q2.
How much more fuel is bought for buses than for trucks?
Answer

300 litres more fuel is bought for buses.

  1. Take the two totals from the table. Buses 1,800 l, trucks 1,500 l.
  2. “How much more” means subtract the smaller from the bigger.
  3. 1,800 − 1,500 = 300 l.
Buses = 6 × 300 = 1,800 l
Trucks = 3 × 500 = 1,500 l
Difference = 1,800 − 1,500 = 300 l
Check it yourself: 1,500 l + 300 l = 1,800 l ✓ The trucks' fuel plus the difference gives the buses' fuel.
Q3.
What is the total quantity of fuel filled from the petrol pump on that day?
Answer

4,021 litres of fuel were filled that day.

  1. Take all five totals from the last column: 1,500 l, 1,800 l, 500 l, 96 l, 125 l.
  2. Add the big ones first. 1,500 + 1,800 = 3,300. Then 3,300 + 500 = 3,800.
  3. Add the small ones. 96 + 125 = 221.
  4. Add the two parts. 3,800 + 221 = 4,021 l.
1,500 + 1,800 + 500 + 96 + 125
= 3,800 + 221
= 4,021 litres
Why group the numbers: Adding five numbers at once is easy to get wrong. Grouping the round hundreds together and the small numbers together makes each step simple enough to do in your head.
Did you notice? 4,021 litres is more than four tonnes of petrol in a single day — and that is only one small petrol pump.
Q4.
Compare the following quantities using the signs <, =, >. (a) 5 l 600 ml ____ 5,400 ml (b) 10 l 100 ml ____ 1 l 600 ml (c) 190 ml + 800 ml ____ 800 ml + 109 ml (d) 3 l 600 ml ____ 3,600 ml (e) 4 l 50 ml ____ 4 l 500 ml
Answer

(a) >   (b) >   (c) >   (d) =   (e) <

Same method as with weights: put both sides into millilitres, then compare.

PartLeft side in mlRight side in mlSign
(a) 5 l 600 ml … 5,400 ml5,600 ml5,400 ml>
(b) 10 l 100 ml … 1 l 600 ml10,100 ml1,600 ml>
(c) 190 + 800 … 800 + 109990 ml909 ml>
(d) 3 l 600 ml … 3,600 ml3,600 ml3,600 ml=
(e) 4 l 50 ml … 4 l 500 ml4,050 ml4,500 ml<
(a) 5,600 > 5,400
(b) 10,100 > 1,600
(c) 990 > 909
(d) 3,600 = 3,600
(e) 4,050 < 4,500
Part (c) is a trap worth studying. Both sides use the digits 1, 9 and 0, and both add 800. But 190 is much more than 109 — the 9 is in the tens place on the left and in the ones place on the right. Place value decides.
Part (b) needs no working at all: 10 litres is already far more than 1 litre, so the answer is > whatever the millilitres are. Always look at the bigger unit first.
Q5.
Sam and Tina fill petrol in their bikes. Tina bought 2 l 500 ml of petrol. Sam bought 2 l 800 ml more petrol than Tina. How much petrol did Sam buy?
Answer

Sam bought 5 l 300 ml of petrol.

The word more tells us to add. Sam took everything Tina took, and 2 l 800 ml on top of that.

Way 1 — add like quantities.

  1. Add the litres: 2 l + 2 l = 4 l.
  2. Add the millilitres: 500 ml + 800 ml = 1,300 ml.
  3. 1,300 ml is 1 whole litre and 300 ml left over.
  4. So the total is 4 l + 1 l + 300 ml = 5 l 300 ml.

Way 2 — change to millilitres first.

2 l 500 ml = 2,500 ml
2 l 800 ml = 2,800 ml
2,500 + 2,800 = 5,300 ml
5,300 ml = 5 l 300 ml
Column form
 l    ml
 2    500
+2    800
――――――
 5    300   (carry 1 l because the ml crossed 1,000)
Read the question carefully: Sam bought 2 l 800 ml more than Tina — not 2 l 800 ml in total. If you had answered 2 l 800 ml you would have missed Tina's amount completely.
Q6.
After refueling, Sam found his fuel gauge reading 9 l. How much fuel did his bike have before refueling?
Answer

Sam's bike had 3 l 700 ml of fuel before refuelling.

  1. Name the parts. Fuel before + fuel filled = fuel after.
  2. We know two of them. Fuel filled = 5 l 300 ml (from the last question). Fuel after = 9 l.
  3. So subtract. Fuel before = 9 l − 5 l 300 ml.
  4. Change to millilitres. 9 l = 9,000 ml. 5 l 300 ml = 5,300 ml.
  5. Subtract. 9,000 − 5,300 = 3,700 ml = 3 l 700 ml.
before = ? filled = 5 l 300 ml after = 9 l The two parts together make the whole tank reading
When two parts make a whole and you know one part, subtract to find the other.
Column form
 l    ml
 9    000
−5    300
――――――
 3    700   (borrow 1 l = 1,000 ml)

Or in ml only: 9,000 − 5,300 = 3,700 ml = 3 l 700 ml
Check it yourself: 3 l 700 ml + 5 l 300 ml = 8 l 1,000 ml = 9 l ✓ That matches the gauge exactly.
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