Question
Four years ago, the ratio of ages of a brother and
sister was 5:6 respectively. 3 years from now, the age of the sister will be twice that of the brother. If the sum of their current age is 47 years, find the current age of the brother.Solution
Four years ago,  let the age of the brother = 5x years. Then, the age of the sister = 5x × (6/5) = 6x years. Present age of the brother = (5x + 4) years. Present age of the sister = 47 - (5x + 4) = (43 - 5x) years. 3 years hence, age of the sister = 6x + 4 + 3 = (6x + 7) years, age of the brother = (43 - 5x + 3) = (46 - 5x) years.  According to the question,  2 × (46 - 5x) = 6x + 7. 92-10x =6x+7 16x =85 Solving, we get x = 5.3 Thus, the current age of the brother = 5x + 4 =5 ×5.3+4= 30.5 years.
Holly, Brian, Fred, Tracy, and Melanie have income elasticities for veggie burgers as given below:
Person Income elasticity ...
Suppose the nominal interest rate is 7 per cent while the money supply is growing at a rate of 5 per cent per year. If the government increases the grow...
Given x=2y+4 and y=kx+6 are the lines of regression of x on y and y on x respectively. Find the value of k if value of r is 0.5.
Which of the following is correct regarding the Durbin-Watson Test?
...For which of the following consumption functions, the value of income multiplier, k=5?
An oil exploration company intends to drill an exploratory well in each of two geologically unrelated regions A and B. If the probability of f...
Which Indian NBFC was selected for the FATF Mutual Evaluation report 2023-24?
The data about sales and advertisement expenditure of a firm is given below
Which international body revised India's GDP growth forecast for the fiscal year 2024/25 to 6.8% recently (April 2024)?Â