zack and mandy shared 120 sweets. after. zack gave mandy 10 sweets, he had twice as many sweets as mandy. how many sweets did they have at first? please show working.

Question

please show working

Answer 1

Z + M = 120

Z = 120 - M

Z-10 = 2(M+10)

120-M -10 = 2M +20

3M = 90

M =90/3 = 30 originally for Mandy

Z = 120-30 = 90 originally for Zack

90-10= 80

30+10 =40

80=2 x 40