Question
Which of the following is correct regarding isobars?
I. They have different atomic numbers II. The have same mass numbersSolution
Isobars have different atomic numbers because they have different numbers of protons. They have the same atomic mass because they have just enough neutrons to make the same total of nucleons.
Rhea is 4 years elder to Mohan. The ratio of Rhea’s age 6 years ago to Mohan’s age 2 years hence is 3:4. What is Mohan’s present age?
In 5 years from now, the ratio of ages of P and Q will be 9:5. If age of P after 15 years is 150% more than age of Q 10 years ago, find the difference b...
The ratio of the present age of A to that of B is 7:9. Six years ago the ratio of 1/3 of A’s age at that time and 1/3 of B’s age at that time was 1:...
Two years ago, the combined ages of Armaan and Bikash equaled Chetna's age at that time. Ten years ago, Armaan was twice as old as Bikash. If, in five y...
After 9 years, the age of Meetali will be 4 years less than 2 times of her age, 5 years back. What is Meetali’s present age?
5 years ago from now, the ratio of age of 'A' and 'B' was 9:5, respectively and 5 years hence from now, the ratio of their ages will become 11:7. Find ...
In a company, there are 15 employees. The average age of all the employees is 32 years.If the age of two directors and 1 supervisor is included, then th...
The respective ratio of the present ages of A and B is 4:5. The present age of C is 20% more than that of B. The sum of the present ages of A, B and C i...
A 15-member group has two individuals aged 18 and 23. When excluded, the average age of the rest increases by 3 years. Find the average age of all members.
Five years ago, the age of A was 3 times the age of B. After 7 years, the difference between their ages will be 28 years. Find the present age of A.
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