Question

The variable x varies directly with 5y and x = 15 when y = 75. Find the value of y when x = 7.

Answer 1

As x is 7 and y is 5x, y should be 35

Answer 2

direct=x1:y1::X2:y2

x1=15

X2=7

y1=75

y2=y

in this question 5y is there so,

y1=75×5=375

y2=5×y=5y

15:375::7:5y

15/375=7/5y

y=35ans

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