IBM Company Numerical Ability Averages

Average cost of 5 apples and 4 mangoes is Rs. 36. The average cost of 7 apples and 8 mangoes is Rs. 48. What is the total cost of 24 apples and 24 mangoes?

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IBM Other Question

A student finds the average of 10 positive integers. Each integer contains two digits. By mistake, the student interchanges the digits of one number say ba for ab. Due to this, the average becomes 1.8 less than the previous one. What is the difference between the two digits a and b? Average weight of 25 boys in a class is 48 kgs. The average weight of class of 40 students is 45 kgs. What is the average weight of the 15 girls in the class?