The age of Rani’s father was 49 years and he was 4 years more than 3 times the age of Rani, then what is the age of Rani ?
A) 16 years
B) 15 years
C) 9 years
D) 10 years
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A coin is tossed 500 times and we get heads : 285 times and tails : 215 times When a coin is tossed at random , what is probability of getting (i) a h
Correct Answer - (i) 0.57 (ii) 0.43
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Two coins are tossed 400 times and we get two heads : 112 times, one head , 160 times , 0 head , 128 times . When two coins are tossed at random , wha
Correct Answer - (i) 0.28 (ii) 0.4 (iii) 0.32
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Let \( \vec{a}, \vec{b}, \vec{c} \) be unit vectors such that \( \vec{a}+\vec{b}+\vec{c}=\overrightarrow{0} \). Which one of the following is correct ? [IIT-2007] (a) \( \vec{a} \times \vec{b}=\vec{b} \times \vec{c}=\vec{c} \times \vec{a}=\overrightarrow{0} \) (b) \( \overrightarrow{ a } \times \overrightarrow{ b }=\overrightarrow{ b } \times \overrightarrow{ c }=\overrightarrow{ c } \times \overrightarrow{ a } \neq \overrightarrow{0} \) (c) \( \overrightarrow{ a } \times \overrightarrow{ b }=\overrightarrow{ b } \times \overrightarrow{ c }=\overrightarrow{ a } \times \overrightarrow{ c } \neq \overrightarrow{0} \) (d) \( \vec{a} \times \vec{b}, \vec{b} \times \vec{c}, \vec{c} \times \vec{a} \) are mutually \( \perp \)
Given that \(\vec a, \vec b\) and \(\vec c\)are unit vectors. i.e., |\(\vec a\)| = |\(\vec b\)| = |\(\vec c\)| = 1 And \(\vec a\) + \(\vec b\) + \(\vec c\) = \(\vec 0\) Then \((\vec a+\vec b+\vec c).(\vec a+\vec b+\vec c)=\vec 0.\vec...
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If the age of ‘x’ is 4 times of the age of ‘y’ then represent the information as a linear equation in two variables is….
Correct option is (A) x = 4y Given that age of x is 4 times of the age of y. \(\therefore\) x = 4y will represent the information.
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If the age of ‘x’ is 4 times of the age of ‘y’ then represent the information as a linear equation in two variables is….
2 Answers
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Present age of Rajesh is x years. After 5 years his age will be
C) (x + 5) years
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The age of Rani’s father was 49 years and he was 4 years more than 3 times the age of Rani, then what is the age of Rani ?
Correct option is B) 15 years
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After 12 years the age of Ramu is 3 times the age before he was 4 years then his present age is ………………. years.
Correct option is (D) none Let Ramu's present age be x years. \(\therefore\) Ramu's age before 4 years = (x - 4) years Ramu's age after 12 years = (x + 12) years \(\therefore\) x+12 = 3(x-4) \(\Rightarrow\) x+12...
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The ratio of present ages of P and Q is 3:8 and after 6 years their ages ratio is 4:9 then the age of P at present is …………….. years.
Correct option is (C) 18 Let present ages of P and Q are respectively 3x and 8x. After 6 years, age of P = 3x+6, age of Q = 8x+6. According to given condition, \(\frac{3x+6}{8x+6}=\frac49\) \(\Rightarrow\) 9 (3x+6) =...
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The product of Shikha’s age five years ago and her age 8 years later is 30, her age at both times being given in years. Find her present age.
Let the present age of Shikha be ‘a’ years. Given, product of Shikha’s age five years ago and her age 8 years later is 30 ⇒ (a – 5)(a + 8) =...
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