Q. 633.7( 3 Votes )

# If x varies inversely as y and x = 20 when y = 600, find y when x = 400.

Answer :

If x varies inversely as y.

xy = k(constant) …(i)

If x = 20 and y = 600

xy = 20× 600 = 12000

k = 12000

When x = 400, then from Eq. (i)

y× 400 = k

y × 400 = 12000

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