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পিতা ও পুত্রের বয়সের অনুপাত ১১ঃ ৪ । পুত্রের বয়স ১৬ বছর হলে পিতার বয়স কত?
A ৪৪ বছর
B ৪২ বছর
C ৫২ বছর
D ৫৪ বছর
If x : y be the ratio of two whole numbers and z be their HCF, then the LCM of those two numbers is:
A $${\text{yz}}$$
B $$\frac{{{\text{xz}}}}{{\text{y}}}$$
C $$\frac{{{\text{xy}}}}{{\text{z}}}$$
D $${\text{xyz}}$$
The LCM and HCF of two numbers are 90 and 15 respectively . If one number is 45, the other number is-
A 30
B 60
C 15
D 75
If x:y be the ratio of two whole numbers and z be their HCF, then the LCM of those two number is = ?
A $$yz$$
B $$\frac{{xz}}{y}$$
C $$\frac{{xy}}{z}$$
D $$xyz$$
একটি তেজস্ক্রিয় মৌলের অর্ধেক ক্ষয় হতে সময় লাগে 10 দিন। i. মৌলটির অর্ধায়ু 10 দিন. 0.693 ii. মৌলটির ক্ষয় ধ্রুবক  0.69310iii. মৌলটির সম্পূর্ণ ক্ষয় হতে সময় লাগবে 20 দিন নিচের কোনটি সঠিক?
A i ও ii
B i ও iii
C ii ও iii
D i, ii ও iii
There are two numbers, 1 number is 12 more than the 2"d number. The average of the two numbers is 19. If 2 is added in both numbers, find the ratio of the numbers.
A 5:9
B 11:9
C 4:9
D 9:5
There are two numbers, 1st number is 12 more than the 2nd number. The average of the two numbers is 19. If 2 is added in both numbers, find the ratio of the numbers.
A 5 : 9
B 11 : 9
C 4 : 9
D 9 : 5
There are two numbers , 1 st number is 12 more than the 2nd number . The average of the two numbers is 19. If 2 is added in both numbers , find the ratio of the numbers .
A 5 : 9
B 11 : 9
C 4 : 9
D 9: 5
Sum of 4 consecutive even numbers is greater than three consecutive odd numbers by 81 . If the sum of the least odd and even numbers is 59 then find the sum of largest of odd and even numbers is 59 then find the sum of largest odd and even numbers.
A 69
B 53`
C 65
D 72
In a set of three numbers, the average of first two numbers is 2. The average of the last two numbers is 3, and the average of the first and the last numbers is 4. What is the average of three numbers ?
A 3
B 6
C 9
D 24

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