Question

afla numerele necunoscute: a:3=15rest2 ; b:7=9rest5 ; c×12=60; 5xd=95 ; e:21=3 rest4 ; (f-2):13=4

Answer 1

a:3=15 r 2
a=3×15+2
a=45+2
a=47

b:7=9 r 5
b=7×9+5
b=63+5
b=68

c×12=60
c=60:12
c=5

5×d=95
d=95:5
d=19

e:21=3 r 4
e=21×3+4
e=63+4
e=67

(f-2):13=4
f-2=4×13
f-2=52
f=52+2
f=54