Answer:
Let's analyze the example first:
We have:
3, 4, 6 target 42 answer: (3 + 4)*6
If we solve the equation, we get:
(3 + 4)*6 = 7*6 = 42
So, we need to reorder the first 3 numbers in an expression, such that the solution of the expression is the target number.
a) 2, 5, 6 Target 40
We know that 5*8 = 40
and that 2 + 6 = 8
Then the answer is:
(2 + 6)*5
b) 3, 4, 6 target 12
Here we know that 4*3 = 12
and 6 - 3 = 3
Then the answer is:
(6 - 3)*4
c) 4, 6, 10 target 1.
We know that the quotient of two equal numbers is 1.
And 4 + 6 = 10
Then the answer here is:
(4 + 6)/10
d) 3, 5, 6 target 21
We know that 3*5 = 15
And 15 + 6 = 21
Then the answer here is:
3*5 + 6
e) 2, 7, 10 target 6.
Here is a harder one.
We know that 2*3 = 6
And that 10 - 7 = 3
Then the answer ere is:
2*(10 - 7)
f) 3, 6, 15 target 3
Here we can use:
(15 - 6) = 9
And 9/3 = 3
Then the answer is:
(15 - 6)/3