Question

Cost of 5 calculators and 7 wrist watches is
Rs3650.If the cost of a wrist watch is more than
the cost of a calculator by Rs 110, what is the
cost of a calculator ?​

Answer 1

Answer:

The cost of each calculator is Rs 240

Step-by-step explanation:

Let the cost of each calculator be x

Let the cost of each calculator be xthe cost of a wrist watch is Rs 110 more than x

so

Calculator: x

Calculator: xWrist watch: x+110

Total cost: Rs 3650

(Cost of wrist watces + cost of calculators = total cost)

7(x+110) + 5(x) = 3650

7(x+110) + 5(x) = 36507x+770+5x = 3650

7(x+110) + 5(x) = 36507x+770+5x = 365012x+770 = 3650

7(x+110) + 5(x) = 36507x+770+5x = 365012x+770 = 365012x = 3650-770

7(x+110) + 5(x) = 36507x+770+5x = 365012x+770 = 365012x = 3650-770x = 2880/12

7(x+110) + 5(x) = 36507x+770+5x = 365012x+770 = 365012x = 3650-770x = 2880/12x=240

Therefore, the cost of each calculator is Rs 240.