```go
package main

import (
	"bufio"
	"fmt"
	"os"
)

func main() {
	reader := bufio.NewReader(os.Stdin)
	writer := bufio.NewWriter(os.Stdout)
	defer writer.Flush()

	var n int
	fmt.Fscan(reader, &n)

	for i := 0; i < n; i++ {
		var k, x int64
		fmt.Fscan(reader, &k, &x)
		// The positive numbers with digital root x are: x, x+9, x+18, x+27, ...
		// The k-th such number is x + (k-1)*9
		result := x + (k-1)*9
		fmt.Fprintln(writer, result)
	}
}
```