SOLUTION: Help me work these questions on word problem please; Qs.Express the sentences into mathematical form:and find solution to each of these questions a)At present Mary is four youn

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Question 1044338: Help me work these questions on word problem please;
Qs.Express the sentences into mathematical form:and find solution to each of these questions
a)At present Mary is four younger than her brother Tom.If Tom is n years old,what will be the sum of their age in three years time?if the sum of their age will be 15 then,how old will tom be?
b)The side of an isosceles triangle are 2a,(2a+2)and(2a+2)cm.If the perimeter is 28 cm,find the value of a.
c)The sum of three consecutive numbers is 103.Find these three numbers.
Answer by josgarithmetic(39628) About Me  (Show Source):
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a)At present Mary is four younger than her brother Tom.If Tom is n years old,what will be the sum of their age in three years time?if the sum of their age will be 15 then,how old will tom be?
system%28m=-4%2Bt%2Ct=n%2Cm%2B3%2Bt%2B3=t-4%2B3%2Bt%2B3=2t%2B2=2n%2B2%29
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That will be, in three years time as described, 15.
2n%2B2=15
2n=13
n=13%2F2
n=6%261%2F2, ready to evaluate m and already found is t.


b)The side of an isosceles triangle are 2a,(2a+2)and(2a+2)cm.If the perimeter is 28 cm,find the value of a.

2a%2B%282a%2B2%29%2B%282a%2B2%29=28
a%2Ba%2B1%2Ba%2B1=14
3a%2B2=14
3a=12
a=4


c)The sum of three consecutive numbers is 103.Find these three numbers.

n%2Bn%2B1%2Bn%2B2=103