Question
The average age of (x + 3) students is 20 years. When
their teacher aged 35 years joins them, the average increases by 1 year. Find x% of 400.Solution
Total age of students = 20(x + 3) years According to question, [20(x + 3) + 35] = (20 + 1)(x + 3 + 1) 20x + 60 + 35 = 21x + 84 20x + 95 = 21x + 84 21x – 20x = 95 – 84 x = 11 So, 11% of 400 = 44
Three containers have their volumes in the ratio 3 : 4: 5. They are full of mixtures of milk and water. The mixtures contain milk and water in the ratio...
If A:B:C = 2:3:8 and (C - B) = 130, then find the product of 'C' and 'A'.
There are 84 chocolates in a packet. The ratio of dark chocolates to milk chocolates is 3:2, and the ratio of dark chocolates to white chocolates is 6:5...
If the ratio of the sum invested and simple interest received after 1 year is 25:9 respectively, then find the rate of interest.
The ratio of the number of cars and bikes in a showroom is 8:7, respectively. If 25% of cars are electric and 60% of bikes are sports bikes, find the ra...
If D and E are the mid points of AB and AC respectively of ∆ ABC, then the ratio of the areas of ADE and BCED is ?
A total of Rs.71,000 was distributed among three individuals named Ashish, Bheem, and Chinu. The amount Ashish received compared to Bheem was in the rat...
A factory produces three types of products: A, B, and C. Initially, the production ratio of A to B to C is 3:4:5. The total number of products produced ...
The ratio of the present ages of A and B is 10:7. After 8 years, the ratio of their ages will be 12:9. Find the ratio of their ages 12 years ago.
Shahrukh, Salman and Aamir invested a sum of Rs. 250000 in a business. Salman invested Rs. 30000 more than Shahrukh and Aamir invested Rs. 40000 more th...
Relevant for Exams:
