Ques:- The ratio between the present ages of A and B is 5:3 respectively. The ratio between A’s age 4 years ago and B’s age 4 years hence is 1:1. What is the ratio between A’s age 4 years hence and B’s age 4 years ago?
Recent Answer : Added by Jozef Bugoš On 2022-03-09 16:28:41:
x = 5/3y
x – 4 = y + 4
x – 8 = y
x = 5/3 * (x-8)
5/3x – 40/3 = x
2/3x = 40/3
2x = 40
x = 20
y = 20 – 8
y = 12
x + 4 = 24
y – 4 = 8
Ratio is 24:8 , so 3:1
Ques:- Gold is 19 times as heavy as water and copper is 9 times. In what ratio should these metals be mixed so that the mixture may be 15 times as heavy as water?
A. 2 : 1
B. 3 : 2
C. 4 : 3
D. 5 : 4
Recent Answer : Added by narendra On 2022-09-18 09:02:16:
b
Ques:- a train is moving at speed of 25 kmph , another train moving the same direction at a speed of 49 kmph crossed a man in the first train in 10 sec ? wht is the length of the second train ?
Recent Answer : Added by Admin On 2020-05-17 12:04:15:
Relative velocity of trains = 49kmph -25 kmph = 24kmph
=6.67m/s
Time taken to cross the first train = 10 sec
Length of the second train = Relative Velocity * Time taken
to cross the first Train = 6.67 *10 = 66.7 metres
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Ques:- 30% apples out of 450 are rotten. How many apples are in good condition?
A. 180
B. 240
C. 315
D. 335
Recent Answer : Added by Venu On 2022-08-14 16:44:44:
450÷100×30=135
450-135=315
Ans: 315
Ques:- If $ stands for triple and # for negation, what is the value of #$#3-#5
Ques:- Five persons – P, Q, R, S and T are being compared in weight and height. The second heaviest person. S is the shortest. P is the 2nd tallest and shorter than T, The heaviest person is the third tallest person. There is only one person shorter than Q, who is lighter than T and P respectively.Who is the heaviest person?
Recent Answer : Added by Aditya Jadhav On 2021-12-04 15:03:07:
R
T,P,R,Q,S
Ques:- Three 6 faced dice are thrown together. The probability that no two dice show the same number on them is -.
Recent Answer : Added by Vaishnavi On 2021-04-07 13:42:05:
5/9
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Ques:- If the 3 digit number AB9 is a perfect square then is A an odd digit?
Recent Answer : Added by Shitoshe Wangatia On 2021-12-11 15:07:15:
A perfect square is a square number of a digit. eg 64 is a perfect number, a square of 8
Now digits AB9 is a square number of a number.
AB9 Can also be written as A multiply by B multiply by 9
Get the Square root of AB9
Assumption, A=1, B=1
1*1=1=A, 1*1=1=B Therefore,
Square root of A = A, B = B and 9=3
Therefore
An odd number is a number indivisible by 2.
for example 1,3,5,7…….
Therefore Squares A*B*9= AB9
Where a=1, b=1, 3 as digits.
Conclusion
A=1 is an odd number
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Ques:- By selling 150 mangoes, a fruit-seller gains the selling price of 30 mangoes. Find the gain percent?
Recent Answer : Added by mathew On 2022-05-17 09:07:31:
20 %
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Ques:- What is the equivalent compound ratio of 5:6::7:10::6:5?
Recent Answer : Added by Kushalbabu On 2021-07-21 15:24:53:
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Ques:- The ratio fo Boys to Girls is 6:4. 60% of the boys and 40% of girls take lunch in the canteen. What % of class takes lunch in canteen.
Recent Answer : Added by Admin On 2020-05-17 12:02:27:
(60/100)*60 + (40/100)*40
=52%
Ques:- Find (7x + 4y ) / (x-2y) if x/2y = 3/2 ?
A. 6
B. 8
C. 7
D. data insufficient
Recent Answer : Added by DK BOSS On 2021-07-15 08:19:28:
x/2y=3/2…
therefore
2x=6y
x=3y
therefor
=21y+4y/3y-2y
=25y/y
=25..
there answer=25
so for the above question, we don’t have an option…so answer
is Data Insufficient..
x = 5/3y
x – 4 = y + 4
x – 8 = y
x = 5/3 * (x-8)
5/3x – 40/3 = x
2/3x = 40/3
2x = 40
x = 20
y = 20 – 8
y = 12
x + 4 = 24
y – 4 = 8
Ratio is 24:8 , so 3:1