Examples in Arithmetic for Schools (Paperback)

This historic book may have numerous typos and missing text. Purchasers can download a free scanned copy of the original book (without typos) from the publisher. Not indexed. Not illustrated. 1899 Excerpt: ...in the next, 10 in the uext, 12 in the next, 13 in the next, 12 in the next, 7 in the next; find the average distance travelled in a quarter-ofan-hour. 7. A train travels 1 mile in the first 5 min., 2 miles in the next 5 min., 3 miles iu the next, 3i in the next, 3j in the next, 4 in the next, 4j in the next, i in the next, 1 mile in the next; find its average speed per hour. 8. The average weight of the crew in Question 3 is diminished by 2 lbs. by including the weight of the coxswain; find the weight of the coxswain. 9. The average weight of the 8 oarsmen in a boat is increased by 2 lbs., when one of the crew who weighs 12 stone is replaced by a fresh man; what is the weight of the new man? 10. A merchant buys 50 doz. of wine at 42s. per doz., 40 doz. at 21s. per doz. and 36 doz. at 31s. 6c?. per doz.; what is the average cost per doz.? 11. A landowner lets 100 acres of land at 1 per acre, 150 acres at 25s. per acre and 200 acres at 30s. per acre; what average rent does he get per acre? 12. In a factory a certain number of men receive 50s. per week, 4 times as many receive 45s. per week, and 10 times as many receive 25s. per week; what is the average weekly wage per man 1 13. The average age of the boys in a school of 200 boys is 14-75 years; what will be the average age if 10 new boys come whose average age is 12'3 years? 14. The average age of the boys in a school of 750 boys is 15-4 years; 50 boys leave, thereby diminishing the average of the school to 15-3; find the average age of those who leave. 15. The average age of the boys in a school of 120 boys is 16'5 years, the average age of the 12 masters is 30 years; what is the average age of the boys and masters together 1 16. The merchant in Question 10 sells the 50 doz. of wine at a profit of 10...