## 61. 4 boys and 3 girls spent Rs. 120 on an average, of which boys spent Rs. 150 on the average. The the average amount spent by the girls is-

## 62. If the difference between the average of x, y and y, z is 12, then the difference between x and z is :

## 63. In an examination average marks obtained by the girls of a class is 85 and the average marks obtained by the boys of the same class is 87. If the girls and boys are in the ratio 4 : 5, average marks of the whole class (approx.) is closest to :

## 64. The average age of 40 students of a class is 15 years. When 10 new students are admitted, the average is increased by 0.2 year. The average age of the new students is :

## 65. If a, b, c, d, e are five consecutive odd numbers, their average is :

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