Question
The sum of the ages of two persons is 60 years. In 5
years, the ratio of their ages will be 4:5. Find their present ages.Solution
Let the present ages of the two persons be x and y. Then, we are given: x + y = 60 (Equation 1) In 5 years, their ages will be x + 5 and y + 5. We are also given that the ratio of their ages in 5 years is 4:5, so: (x + 5)/(y + 5) = 4/5 Cross multiply to get: 5(x + 5) = 4(y + 5) 5x + 25 = 4y + 20 5x - 4y = -5 (Equation 2) Now, solve the system of equations: From Equation 1: y = 60 - x Substitute into Equation 2: 5x - 4(60 - x) = -5 5x - 240 + 4x = -5 9x = 235 x = 235/9 β 26.11 (rounded) So, x β 26 years, and y β 34 years (since x + y = 60). Thus, the ages are approximately 26 and 34 years. Correct Option: a) 26 years and 34 years
Find the difference of day had the highest number of books and that of lowest number of books sold?
A sold 30% more apples than B. Ratio of number of apples sold by B to number of apples sold by C is 11:12. Find the number of apples sold by A if number...
What approximate value should come in the place of question mark (?) in the following questions?
119.98% of 249.99 + (1 / 5.99) of 359.95 = ? x 3.99
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exact value.)
115.98 + 109.01 + (β575 - 17) X 20.09 - 204.89 + 38.03 = ?
? = 26.08 + 18.99 Γ 25.07
(48.89 Γ· 7.08) Γ (35.96 Γ· 4.11) + (9.02 Γ 1.99) = ?
- What approximate value will come in place of the question mark (?) in the following question? (Note: You are not expected to calculate the exactvalue.)
98.999 x 99.001 + 640.856=?