Advertisements
Advertisements
Question
In a class test containing 10 questions, 5 marks are awarded for every correct answer and (− 2) marks are awarded for every incorrect answer and 0 for questions not attempted.
Mohan gets four correct and six incorrect answers. What is his score?
Advertisements
Solution
Marks given for 1 correct answer = 5
Marks given for 4 correct answers = 5 × 4 = 20
Marks given for 1 wrong answer = −2
Marks given for 6 wrong answers = −2 × 6 = −12
Score obtained by Mohan = 20 − 12 = 8
RELATED QUESTIONS
Find the product, using suitable properties:
15 × (− 25) × (− 4) × (− 10)
Find the following product: (– 25) × 37 × 4
Find the following products: (– 1) × (– 5) × (– 4) × (– 6)
Find 16 × 12.
Find 52 × (– 8) + (–52) × 2
(–157) × (–19) + 157 = ______.
If * is an operation such that for integers a and b we have a * b = a × b + (a × a + b × b) then find (–6) * 2
In a test, +3 marks are given for every correct answer and –1 mark are given for every incorrect answer. Sona attempted all the questions and scored +20 marks though she got 10 correct answers.
- How many incorrect answers has she attempted?
- How many questions were given in the test?
A multistorey building has 25 floors above the ground level each of height 5 m. It also has 3 floors in the basement each of height 5 m. A lift in building moves at a rate of 1 m/s. If a man starts from 50 m above the ground, how long will it take him to reach at 2nd floor of basement?
If Δ is an operation such that for integers a and b we have a Δ b = a × b – 2 × a × b + b × b (–a) × b + b × b then find (–7) Δ (–1). Also show that (–7) Δ (–1) ≠ (–1) Δ (–7).
