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Start learning 50% faster. Sign in nowLet the maximum marks in each subject be 100. ∴ Total score = 60% of (100 + 100 + 100) = 60% of (300) = 180 Also, 75% marks in a subject correspond to 75% of (100) = 75 Let a boy have scored 3x, 4x and 5x in the three subjects. ∴ 3x + 4x + 5x = 180 ∴ 12x = 180 i.e. x = 15 Hence, his marks in the three subjects are 45, 60 and 75. Hence, he has scored more than 75 in exactly no subject.
Find the area enclosed between the curves y=(x−4)2 and y=16−x2over their intersection interval.
A car travels 300 km at a speed of 60 km/h and another 200 km at a speed of 80 km/h. Find the approximate average speed of the car for the entire journey.
A jar initially contains 100 liters of alcohol. First, 25 liters of alcohol are stolen and replaced with water. Then, a second person takes 10 liters of...
A man invested $4,800 in a scheme offering compound interest compounded annually. If the difference between the interest earned in the 2nd year and the ...
Solve the equation: 2x² - 8x + 6 = 0.
The length of a rectangle is increased by 20% and the width is decreased by 10%. What is the percentage change in the area of the rectangle?
Find the value of 25 mod 6
If the mean of four observations is 20 and when a constant C is added to each observation the mean becomes 22 the value of C is –
55-litres of paint is added to a mixture of paint and oil in the ratio 3:5. The ratio of paint and oil in the resulting mixture is 4:3. Find the total v...
A bag contains red, blue, and green balls in the ratio of 2:4:5. If two balls are randomly selected from the bag, the probability that both are blue is ...
