Question

a) (47+6×4+2×7)÷a=5
b) (6×7-3×9+5×6)÷b=9
c) 63÷9×a=49
d) b÷7=64÷8
e) 72:c=56÷7
f) x+859=1206
g) y-311=999
h) 1200-z=990
i) 439+147+m=912
j) 36÷9×d=912

Answer 1

a)

( 47 + 6 × 4 + 2 × 7 ) : a = 5

( 47 + 24 + 14 ) : a = 5

( 71 + 14 ) : a = 5

85 : a = 5

a = 85 : 5

a = 17

b)

( 6 × 7 - 3 × 9 + 5 × 6 ) : b = 9

( 42 - 27 + 30 ) : b = 9

( 15 + 30 ) : b = 9

45 : b = 9

b = 45 : 9

b = 5

c)

63 : 9 × a = 49

7 × a = 49

a = 49 : 7

a = 7

d)

b : 7 = 64 : 8

b : 7 = 8

b = 8 × 7

b = 56

e)

72 : c = 56 : 7

72 : c = 8

c = 72 : 8

c = 9

f)

x + 859 = 1206

x = 1206 - 859

x = 347

g)

y - 311 = 999

y = 999 + 311

y = 1310

h)

1200 - z = 990

z = 1200 - 990

z = 210

i)

439 + 147 + m = 912

586 + m = 912

m = 912 - 586

m = 326

j)

36 : 9 × d = 912

4 × d = 912

d = 912 : 4

d = 228