Question

Reciprocal of x is 0.25, reciprocal of y is 10. work out value of xy

Answer 1

2/5=0.4

Explanation:

`(1)/(x)\\`=0.25 ==> x=4

`(1)/(y)\\`=10 ==> y=1/10

Now multiply both x and y

xy=4(1/10)=2/5=0.4

Answer 2

xy =
`(2)/(5)`

Explanation:

Given the reciprocal of x is 0.25, that is
`(1)/(4)` then

x =
`(1)/((1)/(4) )` = 4

Given the reciprocal of y is 10 then

y =
`(1)/(10)`

xy = 4 ×
`(1)/(10)` =
`(4)/(10)` =
`(2)/(5)`