Question

Rob is saving to buy a new mp3 player.For every $15 he earns babysitting,he saved $6.On Sunday,Rob earned $75 babysitting.How much money did he save?

Answer 1

Ok so first of all, Why does rob need a mp3 player? we are in the new age, right?

Secondly, I will answer your question :P

Ok so we have some info here .... we know that Rob earns $15 and saves $6

We can assume that Rob earning's equation would be y = 15x-6x

We are also given that he earned $75 (My gosh Rob nice work man!)

we would plug in 75 for y >>>for now forget the fact that Rob saves<<<

Divide 75 by 15 which = 5

Now multiply 6 by 5 which = 30 (AnSWERR!)

We now also know that out of what Rob earned he used or donated to charity $75-30 = $ 45

We can double check our work here real quick

`45=15x-6x\\45=(15*5)-(6*5)\\45= 75 - 30 \\45 = 45  true`