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Răspuns:

(a+81:9)x5=295

(a+9)x5=295

a+9=295:5(mersul invers)

a+9=59

a=59-9(iar mersul invers)

a=50

b) (bx4+20):2=54

bx4+20=54x2(iar mersul invers)

bx4+20=102

bx4=108-20(iar mersul invers)

b=88:4

b=22

Răspuns:

Explicație pas cu pas:

a) ( a + 81 :9 ) x 5 = 295

( a + 9 )x 5 = 295

a + 9 = 295 : 5

a + 9 = 59

a = 59 - 9

a= 50 numărul de dinții ai vulpii

b ) ( b x 4 + 20 ) : 2 = 54

( b x 4 + 20 ) = 54 x 2

( b x 4 + 20 ) = 108

b x 4 = 108 -20

b x 4 = 88

b = 88 : 4

b = 22 ore doarme iepurele pe zi