Question
Five years ago, the ratio of ages of 'A' and 'B' was 4:5.
Seven years from now, their age ratio will be 5:6. Find the present age of 'Y' who is 6 years younger than 'B'.Solution
ATQ,
Let the age of 'A' and 'B', five years ago be '4a' and '5a' years, respectively.
So, (4a + 5 + 7) : (5a + 5 + 7) = 5 : 6
Or, 6 × (4a + 12) = 5 × (5a + 12)
Or, 24a + 72 = 25a + 60
Or, a = 12
Required age = 5 × 12 + 5 - 6 = 59 years
Which one of the following is correct?
28 * 7 * 8 * 10
Which signs should be interchanged to make the given equation correct.
45 ÷ 5/3 + 10 × 2/5 - 5 = 95
Which of the following is correct?
Select the correct combination of mathematical signs from the options given to replace # signs and get a balanced equation. 24 #8 #4 # 10 # 2
If ‘#’ denotes ‘-‘, @ denotes ‘×’, ‘$’ denotes ‘+’ and ‘%’ denotes ‘÷’, then
20 $ 15 # 10 @ 45 % 15
...The given equation has been solved on the basis of a certain rule. Find the correct answer for the unsolved equation on that basis.
If p × ...
Which two signs should be interchanged to make the given equation correct?
225 + 5 × 3 ÷ 5 – 7 = 133
Select the correct combination of mathematical signs to sequentially replace the signs, to balance the following equation.
(12*7*6)* 13 *6
If 'P' denote '÷', 'θ' denotes 'x', 'R' denotes '+' and 'S' denotes '-', what is the value of ' 18 θ 12 P 4 R 5 S 6 '.
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