Given condition is :
The conversion estimate rate is given as = £3 equals €4 (euros)
So,
£1 equals to €4/3
or [tex]\frac{4}{3}[/tex] = €1.33 (euros)
So, 13.70 pounds become:
£13.70 equals to [tex]13.70\times1.33[/tex]
= €18.22 (euros) approximate
Hence, approximate value of £13.70 is 18.22 euros or €18.22.