The age of the father is 30 years more than the son's age. Ten years hence, the father's age will become three times the son's age that time. What is the son's present age in years?
(15.01)2x √730 =?
561÷35.05 x 19.99 =?
25.05 x 123.95 + 388.999 x 15.001= ?
1/8 of 2/3 of 3/5 of 1715 = ?
32.05 % of 259.99= ?
