EXERCISE 8.2

Check whether the following numbers are in proportion

$4, 12, 21, 63$

Check whether the following numbers are in proportion

$5, 20, 72, 30$

Check whether the following numbers are in proportion

$48, 20, 432, 180$

Check whether the following numbers are in proportion

$24, 312, 14, 182$

Find $x$ if $x:39::8:6$

Given the numbers $6, 7, 18, 22$. What number must be subtracted from each of the following numbers, so that they will be in proportion?

Reema is a young independent woman who runs a tailoring unit. In a week, the unit can produce $560$ night suits. Reema gets an order for stitching $1200$ night suits in $12$ days. Will she be able to complete the work in time? If not, how many more days will she required to complete the order ?