In a class the ratio of number of boys to the number of girls is 4:5. If the number of girls is 20, find the number of boy ??

25

Step-by-step explanation:

The answer is 25 because if the ratio is 4:5 and there are 20 girls that means they multiplied 4 times 5 to get 20 and that means you have to do the same to the ratio of boy and when you multiply 5 times 5 you get 25

Let x and y be the no. of boys and girls in the class.

Then,

x/y = 4/5

=> 20/y = 4/5 [Given that x = no. of boys = 20]

=> 4y = 20×5

=> 4y = 100

=> y = 100/4

=> y = 25

Therefore the no. of girls in the class is 25

Step-by-step explanation:

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answer: evaluate the objective function at each vertex to determine which - and -values, if any, maximize or minimize the function. example: find the minimum value and maximum value of the objective function f ( x , y ) = 4 x + 5 y , subject to the following constraints