Joshua spent 3/7 of his money on souvenirs on his vacation. He has $16 left. How many did he spent on souvenir

He spent $12 on souvenirs

Let us assume the total amount of money Joshua had = x

Amount of money Joshua had left after spending on souvenir = $16

Then

(3x/7) + 16 = x

3x + 112 = 7x

112 = 7x - 3x

112 = 4x

x = 112/4

= 28

Now

The amount of money spent on souvenir = (3/7) * 28

= 3 * 4 dollars

= 12 dollars

So the total amount of money spent on souvenirs by Joshua is $12