Question

Express:
(a) 60 litres as a percentage of 40 litres.
(b) 90 cm as a percentage of 4.5m.​

Answer 1

$x\% \: of \: 40 \: litres = 60 \: litres$

$\frac{x}{100} \times 40 = 60 \\ 40x = 6000 \\ x = \frac{6000}{40} \\ x = 150$

60 litres is 150% of 40.

$x\% \: of \: 450 = 90 \\ \frac{x}{100} \times 450 = 90 \\ 450x = 9000 \\ x = \frac{9000}{450} = 20$

90 cm is 20% of 4.5 m.

b)4.5 m=(4.5×100)cm=450 cm