Question

what should be added to the sum of 3.8 and 1.53 to get 7 ?

Answer 1

3.8+1.53=5.33
let the no. to be added = x
5.33+x=7
x=7-5.33
x=1.67

1.67 should be added

Answer 2

first add
1.53+3.8
=5.33
now subtract
7-5.33
=1.67
answer