If a certain sum of money amounts to Rs. 16940 in 6 years at 9%, with simple interest then find the principal amount

Sita and Geetha can to a job in 15 days and 10 days respectively. they began to work together but Sita leaves after some days and Geetha finishes remaining job in 5 days. After how many days did Sita leave

Find the value of √43+√31+√21+√16

Sum of all 2 digit natural numbers which are divisible by 7 is

A and B can do a work in 12 days, B and C in 15 days, C and A in 20 days. In how many days will they finish it together

A shopkeeper mixes 20 kgs of rice which cost Rs. 5 per kg with 35 kg of rice which cost Rs. 7 per kg. Then he sells the mixture at Rs. 6.50 per kg. Find his profit percentage.