Mr John is 7 times as old as his grandson.In 3 years time, the sum of their ages will be 102. How old is Mr John now?

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(☐)^′	`ddx`	∂∂`x`	∫	∫_□^□	lim	∑	∞	`θ`	(`f` ◦ `g`)	`f`(`x`)

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≥	≤	·	÷	`x`^◦	(☐)	\|☐\|	(`f` ◦ `g`)	`f`(`x`)	ln	`e`^☐
(☐)^′	∂∂`x`	∫_□^□	lim	∑	sin	cos	tan	cot	csc	sec

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Lauren′s age is half of Joe′s age. Emma is four years older than Joe. The sum of Lauren, Emma, and Joe′s age is 54. How old is Joe?

Solution

Joe′s age is: 20

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Translate the problem into an equation

Solve the equation

Joe′s age is: 20

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+▭▭	>	4	5	6	×	☐☐☐
×▭▭	(	1	2	3	−	`x`
▭ \|▭	)	.	0	=	+	`y`

Mr John is 7 times as old as his grandson.In 3 years time, the sum of their ages will be 102. How old is Mr John now?

Solution

Solution steps

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