We have to find 10% of 15tonnes
[tex]\\ \bull\tt\looparrowright 10\%\:of\:15[/tex]
[tex]\\ \bull\tt\looparrowright \dfrac{10}{100}\times 15[/tex]
[tex]\\ \bull\tt\looparrowright \dfrac{150}{100}[/tex]
[tex]\\ \bull\tt\looparrowright 1.5\;tonnes[/tex]