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0 / 60 seg.
John's mother is thrice his age. 11 years from now, his mother's age will be twice that of his. How old is his mother?
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Clue
LET J AND M BE JOHN'S AND HIS MUM'S AGE RESPECTIVELY. BASED ON THIS, YOU CAN COME UP WITH 2 EQUATIONS: 1ST EQUATION: 3J = M 2ND EQUATION: 2J = M + 11 SOLVING FOR J AND M GIVES 11 AND 33 RESPECTIVELY. JOHN'S MOTHER IS 33 YEARS OLD
HE IS 16 YEARS OLD. WHEN I WAS 4 YEARS OLD, MY BROTHER WAS 2 YEARS OLD (HALF MY AGE), SO MY BROTHER IS 2 YEARS YOUNGER THAN ME. WHEN I AM 18 YEARS OLD, MY BROTHER WILL BE 16 YEARS OLD AS HE IS 2 YEARS YOUNGER THAN ME
HIS SISTER IS 99 YEARS OLD. WHEN TOM WAS 2 YEARS OLD, HIS SISTER WAS 1 YEAR OLD. 98 YEARS LATER, HE BECOMES 100 YEARS OLD. AND 98 YEARS LATER, HIS SISTER WILL BE 99 (98 + 1) YEARS OLD
I AM 19 YEARS OLD AND MY SISTER IS 9. LET X = MY SISTER'S AGE AND Y = MY AGE. Y = X + 10 Y + 1 = 2(X + 1) Y = 2X + 1 SUBSTITUTING THIS RESULT IN OUR FIRST EQUATION, WE HAVE: 2X + 1 = X + 10 X = 9 SO Y = 19 WHEN MY SISTER WAS 5, I WAS 3 TIMES OLDER THAN SHE WAS
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