# The mass of a bolt with a nut is 49g, and the mass of four bolts is 70g more than the mass

March 24, 2021 | education

| **The mass of a bolt with a nut is 49g, and the mass of four bolts is 70g more than the mass of five nuts. What is the mass of a bolt and the mass of one nut?**

Let’s compose a system of equations in which we denote the mass of the bolt as x grams, and the weight of the nut as in grams.

Thus, we get:

x + y = 49 g.

4 * x – 5 * y = 70 g.

We express the weight of one bolt x from the first equation of the system.

x = 49 – y.

Substitute the found value into the second equation.

4 * (49 – y) – 5 * y = 70.

196 – 4 * y – 5 * y = 70.

9 * y = 126.

y = 126/9 = 14 grams (weight of one nut).

Find the mass of the bolt.

x = 49 – 14 = 35 grams.

Answer: The bolt weighs 35 grams, the nut 14 grams.

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