# Arithmetic for Beginners; A School Class-Book of of Commercial Arithmetic

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## Description

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. 1888 edition. Excerpt: ...to do some work in a certain time, if the number of men were doubled for the same work, they ought to do it in half the time. In problems in Arithmetic stated in the following form it is always understood that when one of the two quantities of this nature is multiplied the other is consequently divided by the same number. It must of course be also true that if one of these quantities is divided, the other must be multiplied by the same number. Example i. If 9 men do a piece of work in 7 days, in how many days will 1 man do the samel The answer required consists of a number of days, also, the less men, the more dayst; hence, since the number of days in which 9 men can do the work is 7, therefore the no. of days in which 1 man can do the work is 9 times 7, that is, 63 (days). Example ii. If 9 men can do a piece of work in 20 days, how many men could do it in 15 days? The answer required is a number of men, also, the more days the less men; hence, aince the number of men who do the work in 20 days is 9, therefore the no. of men who could do it in 1 day is 20 times 9, and the number of men who could do it in 15 days is of 20 times 9, that is, -ll3 or 12 (men). EXAMPLES. LXXXIX. 1. If 11 men can dig a trench in 7 days, in how many days could 1 man dig the same trench? 2. If 36 horses can plough a field in 4 days, in how many days can 4 horses plough the same field? 3. If a' certain quantity of corn will feed 8 horses for 45 days, how long will the same quantity feed 15 horses? 4. If a certain store of food will feed 2500 men for 108 days, how many men will the same store feed for 45 days? 5. If a certain amount of corn will feed 24 horses for 25 days, how many horses will the same corn feed for 15 days? 6. If 56 horses can plough a field in 35 days, .show more

## Product details

• Paperback | 38 pages
• 185.42 x 241.3 x 5.08mm | 86g
• Miami Fl, United States
• English
• Illustrations, black and white
• 1236608445
• 9781236608444