Question

plz ans me guess plz let me know ​

Answer 1

Step-by-step explanation:

a) let no. be x

4% of x=1.8

4/100*x=1.8

x=1.8*100/4

x=45

b) let the no. be y

90%of y=279

90/100*y=279

y=279*100/90

y=310