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4 boys can scrub the whole floor of a school hall in 2 and 1/2 hours. How long will it take 5 boys to scrub the floor at the same rate?

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(4/5) as long ? About 2 hours?

or how about 1 boy could do it in 2.5 * 4 = 10 hr
so 5 boys can so it in 10/5 = 2 hr ?

hey -- give it a rest, willya?

Did you know?

When it comes to teamwork, the number of individuals involved can impact the time it takes to complete a task. For instance, if 4 boys can scrub the entire floor of a school hall in 2 and 1/2 hours, it makes you wonder how long it would take if 5 boys were assigned the same task, assuming they work at the same rate. Let's break it down: If 4 boys can complete the job in 2 and 1/2 hours, it means that their combined effort scrubs 1/2 of the floor in 1 hour. To find out how long it would take 1 boy to scrub half of the floor, we divide the 1-hour rate by 4 (the number of boys): 1/2 floor ÷ 4 boys = 1/8 floor per boy in 1 hour. Now, we can determine how long it would take 5 boys to scrub the entire floor: 1 floor ÷ (5 boys × 1/8 floor/boy/hr) = 1 floor ÷ (5/8 floor/hr) To simplify further, we multiply the fraction by its reciprocal: 1 floor × (8 floor/hr ÷ 5) = 8/5 hour Therefore, it would take 5 boys the same rate to scrub the floor in 8/5 or 1.6 hours. So, with an extra helping hand, the floor can be scrubbed in even less time!