DAY 59

Comment

Try a value for x. If it does not fit, look for a better value ... .
For example, try x = 6: 60 divided by (6 - 4) is 30;
this is not very close to the chosen value of x (6),
so what might we try next ... ?

Answer

x = 10 (or x = -6).

Readers' methods

Wendy Turvey of West Hartlepool:
Try 7: 60/(7-4) = 20; not very good.
Try 6: 60/(6-4) = 30; worse.
Try 9: 60/(9-4) = 12; quite good.
Try 10: 60/(10-4) = 10; spot on!

xxx