![naomirice24](/avatars/22588.jpg)
naomirice24
07.04.2022 •
Mathematics
Mary and Jane went on a tour together. Mary brought twice as much money as Jane. After Mary had spent $800 and Jane had spent $240, they had equal amount of money left. How much money did Mary have at first?
Solved
Show answers
More tips
- H Health and Medicine These Food Additives Can Do Significant Harm to Your Health...
- F Food and Cooking How to Get Reconfirmation of Registration?...
- C Computers and Internet How to Get Rid of Spam in ICQ?...
- A Art and Culture Who Said The Less We Love a Woman, the More She Likes Us ?...
- F Family and Home How to Get Rid of Your Neighbors?...
- S Society and Politics How Could Nobody Know About the Dead Mountaineers?...
- H Health and Medicine How to Cure Adenoids?...
- H Health and Medicine Why Wearing a Back Brace Can Be Beneficial During Back Strain?...
- S Sport When and Where Will the 2014 World Cup be Held?...
- C Computers and Internet How to Choose a Monitor?...
Answers on questions: Mathematics
- M Mathematics Which statement about geometric figures is true...
- M Mathematics What is the remainder when 4x^2 – 6x – 4 is divided by 2x – 8?...
- M Mathematics Triangle IJK is similar to triangle LMN. Find the measure of side NL. Round your answer to the nearest tenth if necessary. Figures are not drawn to scale. K N 13 22 M...
- M Mathematics Hey I need help with my work?...
- M Mathematics GIVING BRAINLIEST! PLEASE HELP!...
- M Mathematics I WILL GIVE BRAINLIEST AND SEND 50 POINTS IF GOOD no copying from internet What do you know about the angles of a right triangle? A all angles might be right angles. B only one...
- M Mathematics A contractor wants to build a right triangle with legs 5 ft and 12ft. If wood costs $0.75 per foot, how much will it cost him to buy the wood for his project?...
- M Mathematics if a wind turbine costs 1.3 million per megawatts how much would it cost to build a 2.6 megawatts wind turbine...
- M Mathematics What is the probability she got a 2 and then she got a 3...
- M Mathematics What does it mean when the range of one student s scores is less than the range of another student s scores? Range is is the difference between the largest and the smallest value.Mean...
Ответ:
Mary has $1120
Step-by-step explanation:
money mary has at first : x
money jane has at first : y
Mary brought twice as much money as Jane : x=2y
Mary had spent $800 and Jane had spent $240, they had equal amount of money left : x-800=y-240
=>![\left \{ {{x=2y} \atop {x-800=y-240}} \right.](/tpl/images/2719/3370/543a3.png)
=> x=1120
y=560
Ответ:
Step-by-step explanation:
Let the amount mary and jane had be 2x and x respectively.
Let the equal amount be y:
Using the simultaneous equation method, multiply the first equation by the coefficient of x(1) of the second equation and the second equation by the coefficient of x(2) of the first equation:
Subtract the second equation from the first equation:
$320 was their equal amount.
Substitute 320 for y in any equation:
Therefore, Jane had $560 at first and Mary had $1120 at first.
Ответ:
You can get the lowest price at Store A.
Step-by-step explanation:
Store A = $3,802 × 90% = $3,421.80 × 90% = $3,079.62
Store B = $3,802 × 85% = $3,231.70
Store C = $3,802 – $35 = $3,767.00 × 90% = $3,390.30
Therefore, you can get the lowest price at Store A.