Question

What is 1 + 1 + 2 - 7 + 4? Take your answer and make it x. X + 4 - 2 + X. What is the final answer?

Answer 1

4

Explanation:

When you add them the answer is 1.

Now our equation is X plus 4 minus 2 plus X so we will substitute X to our answer which would be

(1) plus 4 -2 plus (1)

1 plus 4 - 2 plus 1

equals to 4

Our answer is 4

Answer 2

(b)

Explanation:

1. In a group of cows and chickens, the number of legs was 14 more than twice the number of heads. The number of cows was:

(a) 5, (b) 7, (c) 10, (d) 12, (e) 14

Solution:

Let the number of cows be x and their legs be 4x.

Let the number of chicken be y and their legs be 2x.

Total number of legs = 4x + 2y.

Total number of heads = x + y.

The number of legs was 14 more than twice the number of heads.

Therefore, 2 × (x + y) + 14 = 4x + 2y.

or, 2x + 2y + 14 = 4x + 2y.

or, 2x + 14 = 4x [subtracting 2y from both sides].

or, 14 = 4x – 2x [subtracting 2x from both sides].

or, 14 = 2x.

or, x = 7 [dividing by 2 on both sides].

Therefore, the number of cows = 7.