Jaikishan and Premkishan Solutions for Exercise 1: Let us Practice

In a group of cows and hens, the number of legs are $14$ more than twice the number of heads. Find the number of cows?

If it takes two workers, working separately but at the same speed, 2 h and 40 min to complete a particular task, about how long will it take one worker, working at the same speed, to complete the same task alone?

Sonu and his friend Rahul went for shopping. Sonu had Rs 500 with him while Rahul had Rs 240. Sonu spent twice as much as Rahul on shopping. Now, Sonu has three times as much money as is left with Rahul. How much money did Sonu spend?

A man has Rs 480 in the denominations of one-rupee notes, five-rupee notes and ten-rupees notes. The number of notes of each denomination is equal. What is the total number of notes that he has?

The ratio of present ages of Sumit and Amit is 3 : 4. If the age of Sumit 20 yr hence will be 62 yr, then what is the present age of Amit?

In a company, $60\%$ workers are males. If the number of female workers in the company is $800$, what is the number of male workers in the company?

The flowers kept in a basket doubles in every one minute. If the basket gets completely filled by flowers in $30 min$, then in how many minutes $\frac{1}{4}th$ of the basket was filled with flowers ?

Some birds are sitting on two branches A and B. If one bird of the branch A fly away and sit on branch B, then the number of birds on both the branches will become equal. But if a bird from branch B flies and sits on the branch A then the number of birds on branch A is double of branch B. What number of birds were sitting on branch A at the beginning?