John is 10 years old. In 5 years time Mary will be twice as old as John will be? How ild is Mary now?
Answer is 20 because the equation is 10 + 5 x 2 so you would use bomdas and multiply would be first so 10+ 10 = 20 Simple
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To find Mary's current age, we can use algebraic equations. Let's assign variables to both John's and Mary's ages.
Let's say John's current age is J, and Mary's current age is M.
From the given information, we know that John is currently 10 years old, so J = 10.
In 5 years, John's age will be J + 5, and Mary's age will be M + 5.
According to the problem, in 5 years, Mary will be twice as old as John will be. Mathematically, this can be expressed as:
M + 5 = 2(J + 5)
We substitute J = 10 into the equation:
M + 5 = 2(10 + 5)
Now, we solve the equation step by step:
M + 5 = 2(15)
M + 5 = 30
M = 30 - 5
M = 25
Therefore, Mary is currently 25 years old.
well, how old will John be in five years?
Mary will be twice that.
So subtract 5 years to get her current age.
or, doing the math by the book,
J = 10
M+5 = 2(J+5)
mary is 25
10-5=5
Mary age=5
10×5=50
50-20=30
Mary age in five years time=30
Mary's current age=27