marting1667 marting1667

23-05-2017
Mathematics

contestada

A money box contains only 10-cent and 20-cent coins. There are 34 coins with a total value of $5.40. How many coins of each

Respuesta :

PHDFlopper PHDFlopper

23-05-2017

10x+20y=540
x+y=34
y=34-x

Plug in (34-x) for y:
10x+20(34-x)=540
10x+680-20x=540
-10x=-140
10x=140
x=14

There were 14 ten cent coins and 20 20 cent coins

Answer Link

Otras preguntas

What are the next two terms of the following sequences?With process

What is the product of the 4 x and the 3 x cubed y squared minus 2 x y cubed?

Simplify the polynomial and evaluate for the following values. x²yxy-xy²xy +xy if x = −3 and y=2

Isaac's car used 7 gallons to travel 308 miles. How many gallons of gas would he need to travel 748 miles?

If 5/33 is expressed in decimal form, what digit is in the 92nd place to the right of the decimal point?

Find the distance distance between z1=(10+4i) and z2=(6+3i)

Which of the following scenarios involves at least one chemical change happening? (2 points) Group of answer choices Before you go swimming, you need to fill up

Elementary School Students Which are true statements when comparing the data in the box plots? Select three choices. The data for elementary school are more con

any one free here??....

How does Peter Binford's title reflect the main idea of his article "Who's Driving the Bus"? How does it reflect the example he uses to illustrate this idea?