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a:b=2:3, c:d=4:5, d:e=3:1, a:d=2:5, find ab+cd/BC+de

this is one of a question in cracku ratio test. in the solution, while calculating bc+de, you have divided 25x square/3 and taken LCM. why have u divided it by 3 ?

x-1/x=3
find
x^4-1/x^4.

question not available in hindi

question is not available in hindi

HOW MANY 4 DIGIT NO.CAN BE MADE WITH THE DIGITS 1,2,3,4,5,6,7 DIVISIBLE BY 25 ONLY ONCE?

hindi me kaise kre questions

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ABCD is a rectangle with AD being longer side.P and Q be the mid-points of AB and CD.x is a point on AD.Then what is the ratio of Area of PQCB to XCB?
a)DQ=PB
b)AP=CQ

question ki language hindi me kaise kre

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An aircraft carries 521 people safely from Kedarnath to Dehradun in 12 hours.How many rounds it take.
1.It can carry a maximum of 54 people at a time.
2.I 45 minute to fly from one city to other and 15 minute while waiting.

Option:
A.If one alone can give the answer but other can not give answer.
B.If both together can give the answer.
C.If either of two can give the answer
D.Neither of two can give the answer

please tell the solution..