use trials ti find the single digit number a for which 35946

use trials ti find the single digit number a for which 359-46+a÷3×25_7×7=339

Solution

359-46+a/3×25 - 7×7=339

Obviously a is a multiple of 3

Lets try 3 :

359 - 46 + 3/3 * 25 - 7*7

313 + 1*25 - 49 ---> not equal to 339

Now lets try 6 :

359 - 46 + 6/3 * 25 - 7*7

313 + 2*25 - 49

313 + 50 - 49

Not equal to 339 either

Gotta be a = 9 right?

Lets confirm....

359 - 46 + 9/3 * 25 - 7*7

313 + 3*25 - 49

313 + 75 - 49

339

Yep all good!

The value is :

a = 9