600 × ( а ÷ 15 ) = 3600

Question

600 × ( а ÷ 15 ) =
3600

Answer 1

40a=3600 a=3600/40=90

Answer 2

600 • ( а : 15 ) = 3600
а : 15 = 3600 : 600
а : 15 = 6
а = 6 • 15
а = 90