The ratio of the number of students to the number of girls students in the school of 1638 students is 5: 2. If the number of girl students increases to 60, then what should be the decrease in the number of students to keep the new ratio of students to girls 4: 3?

A work is finished by ‘A’ alone in 16 hours, ‘B’ alone in 20 hours and 'C' alone in 24 hours. They worked together and finished it and got Rs 777/ - as wages. The share of ' B ' in the wages will be _____ 

Two-person X and Y invested their money in the ratio of 30:28 and the ratio of their respective profits at the end of a year is 10:4. If Y invested the money for 3 months, then for how much time (in months) x invested his money?

Monica deposited a total of Rs. 10500 with a bank in two different deposit schemes at 10% p.a., interest being compounded annually. As per the schemes, she gets the same amount after 2 years on the first deposit as she gets after 3 years on the second deposit. How much money did she deposit for 3 years?

In a 1500 m race, Chaitali beats Vrunali by 100 m and in 1200 m race, Vrunali beats Krutika by 75 m. If Chaitali and Krutika are compared, then for how much m Chaitali will beat Krutika in 900 m race?

29 boys are standing in a line such that distance between any two consecutive boys is same . A teacher takes 7 seconds to reach from first boy to 15th boy. How much more time (in seconds) will he take to reach the 22 boys?