Question

Please solve these equations.

Answer 1

(10). Let no. of Rs.2 be x and Rs.5 be y

Given that she has 80 coins in total, so

x+y=80

Total amount given is Rs.232, so

2x+5y=232... Solve these and get your answer!

(11). Let no. of Rs.10 be x and Rs.50 be y

10x+50y=550

y = x - 1... Solve these and get your answer!

(12). Let present age be x years

After 12 years my age will be (x+12) years
4 years ago my age was (x-4) years

Given that (x+12) = 3(x-4)... Solve these and get your answer!

(13). 2 equal sides --> 3x-1 = 2x+2

perimeter = (3x-1) + (2x+2) + 2x... put in value of x from first equation and get your answer!

Phew!!! Last one now, eh?!
Here we go...

(14). Let length be x and breadth be y

Given that x = 3y - 6 and

2x + 2y = 148... Solve these and get your answer!

Just for your help...
Answers:
10. y=24
11. y=9
12. x=12 years
13. x=3units and perimeter=22units
14. length = x = 45m and breadth = y = 17m