Question

5 boys or 3 girls can do a science project in 40 days. How long will it take for 15 boys and 6 girls to do the same project?​

Answer 1

Answer:

8

Step-by-step explanation:

3girls =5boys

6girls=10boys

one day's work of five boys=1/40

one day's work of single boy =1/(40×5)=1/200

now total no of boys=15+10=25

one days work of 25 boys =25×(1/200)=1/8

so the work can be completed in 8 days

Answer 2

Time taken will be $\dfrac{40}{3}$ .

Given :

Time taken by 5 boys or 3 girls to complete a science project in 40 days .

Let , one boy do work x days and one girls do work y days .

Therefore , in mathematics :

$5x+3y=40$

Now , we need to find the time it take for 15 boys and 6 girls to do the same project .

Now , both boys and girls are tripled .

Then the time will be decrease by 3 too .

Therefore , time taken will be $\dfrac{40}{3}$ .

Learn More :

Ratio and Proportion

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