12) Mary is 5 years older than Bob. If the sum of their ages is 39, write and solve an equation to find their ages.
1 answer:
Bob age =x
Mary age= x+5
If we sum the ages
x+(x+5)=39
2x+5=39
then we clear x
2x=39-5
2x=34
x=34/2
x=17
Bob age =17
Mary age=17+5=22
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Required
Find B when T = 40
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Make k the subject
<em>T = 35; when B = 210</em>
When T = 40, we have:
Make B the subject
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