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What will be the least number which when doubled with be exactly divisible by 12, 18, 21 and 30 ?

A630
B1260
C2520
D196
উত্তর : A.
630

শেয়ার :

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সম্পর্কিত প্রশ্ন সমূহ

১.

$2-[ 2 – \{ 2 – 2 ( 2 +2 ) \} ] = ?$

A
-4
B
6
C
4
D
None of these
২.

If 0.4 of a number is equal to 0.06 of another number, the ratio of the numbers is :

A

3:4

B

3:20

C

20:3

D

2:3

৩.

The breadth of a rectangular field is 60% of its length . If the perimeter of the field is 800 m, what is the area of the field ?

A
37500 sq.m
B
40000 sq.m
C
48000 sq.m
D
18750 sq.m
৪.

Peter purchased a machine for TK. 80,000 and spent TK. 5,000 on repair and TK. 1,000 on transport and sold it with 25% profit , At what price did he sell the machine ?

A
TK.1,06,250
B
TK.1,07,500
C
TK.1,17,500
D
1,05,100
৫.

A takes twice as much time as B or thrice as much time as C to finish a piece of work . Working together , they can finish the work in 2 days . B can do the work alone in :

A
6 days
B
8 days
C
12 days
D
4 days
৬.

Which of the following fractions is greater than 34\frac{3}{4}​ and less than 56\frac{5}{6}​ ? 

A

​23\frac{2}{3}​​

B

​910\frac{9}{10}​​

C

​12\frac{1}{2}​​

D

​45\frac{4}{5}​​

৭.

2, 5, 9, 19, 37, ?

A
75
B
76
C
78
D
73
৮.

Rahim ranks seventh from the top and twenty-sixth from the bottom in class . How many students are there in the class ?

A
32
B
33
C
34
D
31
৯.

How many days are there in x weeks x days?

A
8x
B
14x
C
7
D
7×2
১০.

Pipes A and B can fill a tank in 5 and 6 hours respectively. Pipe C can empty it in 12 hours. If all the three pipes are opened together, then the tank will be filled in:

A
2(8/11) hours
B
3(9/17)hours
C
4(1/2) hours
D
11(3/17)hours