See Aishwarya's answer to Joanna's Secondary 2 Maths Singapore question

Aishwarya's answer to Joanna's Secondary 2 Maths Singapore question.

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i think you might have made a small presentation error in part (a), mary is only x years old but you had 2x, i think that’s why the error got carried forward to part (b), hope this helps!

Date Posted: 1 year ago

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Joanna

1 year ago

But if John is 13 years old presently, that means Mary is 10years old presently. However in 5 years time, their total age will be 33years.. (Not 28years as per question)..

Aishwarya

1 year ago

heyy! the question said john is 3 years older than twice Mary’s age, so if john is 13
mary is —> 13-3=10
10/2=5( cus twice +3)
then in 5 years they are
(13+5)+(5+5)=28
does this make sense?