# Calculate the number 6724

NUMBERMANIA: Calculate the number 6724 using numbers [1, 7, 4, 8, 52, 789] and basic arithmetic operations (+, -, *, /). Each of the numbers can be used only once.Correct answers:

**24**The first user who solved this task is

**Djordje Timotijevic**.#brainteasers #math #numbermania

### Efficiency Expert

An efficiency expert concluded his lecture with a note of caution. "You need to be careful about trying these techniques at home."

"Why?" asked somebody from the audience.

"I watched my wife's routine at dinner for years," the expert explained. "She made lots of trips between the refrigerator, stove, table and cabinets, often carrying a single item at a time.

One day I told her, 'Honey, why don't you try carrying several things at once?'

"Did it save time?" the guy in the audience asked.

"Actually, yes," replied the expert. "It used to take her 30 minutes to make dinner.

Now I do it in ten..."