My mother is 12 years more than twice my age. after 8 years she will be 20 years less than three times my my age and my mothers age
hi i would like you to tell me step by step how you did it (the equation)

Hello,

m is the mother 's age
a is your age

My mother is 12 years more than twice my age. ==>m=2a+12 (1)


after 8 years she will be 20 years less than three times my age:

in 8 years: mother 's age=m+8
your new age: a+8

m+8=3*(a+8)-20 (2)

m=2a+12 (1)
(2a+12)+8=3*(a+8)-20 (for (2))
==>2a+20=3a+24-20
==>3a+4=2a+20
==>3a-2a=20-4
==>a=16 (your age )

m=2a+12=2*16+12=32+12=44

Proof: m=2a+12==>44=2*16+12
m+8=3(a+8)-20==>44+8=3(16+8)-20 ==>52=72-20

Answer for 2: his profit would be $2.88 explanation: you have to first multiply 72 and 0.12 together to get $8.64 once you do that you know how much money the shopkeeper made from selling the candy bars individually. so you have to do 8.64-5.76=2.88 hope that ; )answer for 3: yeah i’m sorry i have no idea what number 3 is. i’m sorry i couldn’t with that.

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