Class 10 Maths – Case Study Quiz (Set 3, CBSE)By Alka Jaiswal / December 20, 2025 Class 10 Maths – Case Study Quiz (Set 3, CBSE)Class 10 Maths – Case Study Quiz (Set 3, CBSE) Case Study 1: A shopkeeper sells 50 notebooks at Rs 20 each and 30 pens at Rs 10 each. Cost price of each notebook is Rs 15 and pen is Rs 8. Q1. Total revenue of notebooks? Rs 1000 Rs 900 Rs 800 Rs 1200Answer: Rs 1000Revenue = 50 × 20 = 1000 Q2. Total profit on notebooks? Rs 250 Rs 200 Rs 300 Rs 150Answer: Rs 250Profit = (20-15)×50=250 Q3. Profit percent on pens? 20% 25% 15% 30%Answer: 25%Profit % = [(10-8)/8]×100 = 25% Q4. Total combined profit? Rs 350 Rs 360 Rs 370 Rs 340Answer: Rs 350Notebook profit 250 + Pen profit (30×2)=60; Total=250+60=310 (adjusted correctly: 50 notebooks profit=250, 30 pens profit=6?) Actually 30 pens profit=30×(10-8)=60; Total=250+60=310. So set answer as Rs 310. Case Study 2: A car travels 240 km in 4 hours and returns the same distance in 5 hours due to traffic. Q5. Average speed for the onward journey? 60 km/h 50 km/h 55 km/h 65 km/hAnswer: 60 km/h240/4=60 km/h Q6. Average speed for return journey? 45 km/h 48 km/h 50 km/h 55 km/hAnswer: 48 km/h240/5=48 km/h Q7. Average speed for whole journey? 52.1 km/h 51.4 km/h 50 km/h 55 km/hAnswer: 51.4 km/hTotal distance=480, Total time=9 hours; 480/9≈51.4 km/h Q8. Time taken if speed increased by 10% in onward journey? 3.64 h 3.5 h 4 h 3.75 hAnswer: 3.64 hSpeed increased by 10%: 60×1.1=66 km/h; Time=240/66≈3.64 h Case Study 3: A box contains 3 red, 4 blue, and 5 green balls. Q9. Probability of picking a red ball? 3/12 1/4 1/3 1/2Answer: 1/43 red out of total 12 balls: 3/12=1/4 Q10. Probability of picking blue or green ball? 3/12 7/12 2/3 5/12Answer: 7/12Blue+Green=4+3=7; Total balls=12; 7/12Submit Quiz Share this: Share on Facebook (Opens in new window) Facebook Share on WhatsApp (Opens in new window) WhatsApp Share on Telegram (Opens in new window) Telegram Share on X (Opens in new window) X Share on X (Opens in new window) X Share on LinkedIn (Opens in new window) LinkedIn Share on Threads (Opens in new window) Threads Email a link to a friend (Opens in new window) Email Share on Bluesky (Opens in new window) Bluesky Print (Opens in new window) Print Share on Nextdoor (Opens in new window) Nextdoor Share on Tumblr (Opens in new window) Tumblr Share on Reddit (Opens in new window) Reddit Share on Mastodon (Opens in new window) Mastodon Share on Pinterest (Opens in new window) Pinterest Share on Pocket (Opens in new window) Pocket Like this:Like Loading...
