If x2 + 4y2 = 4xy, then x : y is - a) 1 : 1 b) 1 ...
View QuestionIf a : b = 5 : 7 and c : d = 2a : 3b then ac : bd is = ?
a)20 : 38 b) 50 : 147 c) 10 : 21 d) 50 : 151 Answer: b Explanation: $$\eqalign{ & {\text{a}}:{\text{b}}\,\,\,\,\,\,\,\,\,\,\,\,{\text{c}}:{\text{d}} ...
View QuestionIf a : b = c : d, then (ma+nc)/(mb+nd) is equal to –
If a : b = c : d, then $$\frac{{{\text{ma}} + {\text{nc}}}}{{{\text{mb}} + {\text{nd}}}}$$ is equal to ...
View QuestionThe ratio of the numbers of boys and girls in a school was 5 : 3. Some new boys and girls were admitted to the school, in the ratio 5 : 7. At this, the total number of students in the school became 1200 and the ratio of boys to girls changed to 7 : 5. The number of students in the school before new admissions was = ?
a) 700 b) 720 c) 900 d) 960 Answer: d Explanation: $$\eqalign{ & \,\,\,\,\,\,\,\,\,\,\,{\text{A}}:{\text{B}} \cr & \,\,\,\,\,\,\,\,\,\,\,\,\,5:3 \cr & ...
View QuestionThe monthly salaries of A, B and C are in the ratio 2 : 3 : 5. If C’s monthly salary is Rs. 12000 more than that of A, then B’s annual salary is = ?
a) Rs. 120000 b) Rs. 144000 c) Rs. 180000 d) Rs. 240000 Answer: b Explanation: A : B : C 2 : 3 : 5 Let ...
View QuestionA mixture contains wine and water in the ratio 3 : 2 and another mixture contains them in the ratio 4 : 5. How many litres of the latter must be mixed with 3 litres of the former so that the resulting mixture may contain equal quantities of wine and water = ?
a) $$5\frac{2}{5}{\text{ litres}}$$ b) $$5\frac{2}{3}{\text{ litres}}$$ c) $$4\frac{1}{2}{\text{ litres}}$$ d) $$3\frac{3}{4}{\text{ litres}}$$ Answer: a Explanation: ...
View QuestionIf x/2 = y/3 = z/4 = (2x-3y+5z)/4, then the value of k is –
If $$\frac{x}{2} = \frac{y}{3} = \frac{z}{4} = $$ $$\frac{{2x - 3y + 5z}}{k}{\text{,}}$$ then the value ...
View QuestionIn an innings of a cricket match,three players A, B and C scored a total of 361 runs. If the ratio of the number of runs scored by A to that scored by B and also number of runs scored by B to that scored by C be 3 : 2, the number of runs scored by A was = ?
a) 171 b) 181 c) 185 d) 161 Answer: a Explanation: Given total runs of A, B, C (A + ...
View Question200 litres of a mixture contains milk and water in the ratio 17 : 3. After the addition of some more milk to it, the ratio of milk to water in the resulting mixture becomes 7 : 1. The quantity of milk added to it was =?
a) 20 Litres b) 40 Litres c) 60 Litres d) 80 Litres Answer: b Explanation: Milk ...
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