Question

a+75+65:5=115 b. 300-b×8-109=47 c.(48×c+216):40=27

Answer 1

a + 75 + 65 : 5 = 115

a + 75 + 13 = 115

a + 75 = 115 - 13

a + 75 = 102

a = 102 - 75

a = 27

300 - b × 8 - 109 = 47

300 - b × 8 = 47 + 109

300 - b × 8 = 156

b × 8 = 300 - 156

b × 8 = 144

b = 144 : 8

b = 18

( 48 × c + 216 ) : 40 = 27

48c + 216 = 1080

48c = 864

c = 18

Answer 2

a) A+75 + 13 =115 => A+88 = 115 => A=115-88 = 27
b) 300-bx8 -109 =47 => 300-109 -47 = bx8 => 144 = bx8 => b=144:8=18
c) (48xc +216):40 = 27 <=> 48xc :40 + 54:10 =27 <=>
 48xc :40 = 27 - 54:10 = 27-5,4= 21,6 <=> cx48:40 =21,6 <=> cx1,2=21,6 => c=21,6:1,2= 18