Question

a x b x 5 = 40 , a x a x 7 =63 ,8 x a x b = 64 , 6 x a x b = 54,

Answer 1

a*b*5=40
a*b=40:5
a*b=8
a*a*7=63
a*a=9
a^2=9
a=3
8*a*b=64
a*b=64:8
a*b=8
6*a*b=54
a*b=54:6
a*b=9

Answer 2

a x a x 7 =63 => a² = 9 => a = 3
a x b x 5 =40 => a x b = 8
3 x b = 8 => b = 8 pe 3
 8 x a x b  = 64 => 8 x 3 x 8 pe 3 = 64
3 cu 3 se simplifica => 8 x 8 =64