Question

calculeaza numarul necunoscut 42:(dx3)=21:3

Answer 1

$42 \div (d \times 3) = 21 \div 3$

$42 \div 3d = 7$

$3d = 42 \div 7$

$3d = 6$

$d = 6 \:\div\:3$

$d = 2$

Answer 2

42 : ( d x 3 ) = 21 : 3

42 : ( d x 3 ) = 7

42 = 7 x 3d

42 = 21d

d = 42 : 21

d = 2