Question
If the total cost of 6 notebooks and 4 pencils is Rs. 240
and the total cost of 5 notebooks and 3 pencils is Rs. 195, then find the cost of 7 notebooks.Solution
ATQ,
Let the cost of one notebook and one pencil be Rs. x and Rs. y, respectively.
ATQ;
6x+4y=240.......(I)
5x+3y=195.......(II)
Multiply Equation (II) by 4 and Equation (I) by 3, then subtract:
20x+12y−18x−12y=780−720
2x=60
x=30
Cost of 7 notebooks = 7×30=210 Rs.
If B obtained a profit of Rs.80 on each bag and A obtained a profit of Rs.25 on each watch, what will be the ratio of total profit of B on bags to the t...
If female employee promoted in SBI are 50% more than promoted male employee in SBI and male employees who are promoted in UBI are 100% more than male e...
If the ratio of total number of male employees to female employees in department B in year 2020 is 2:5, then find total number of male employees in depa...
Find the ratio of number of regular sized Pizzas baked on Thursday and Friday together to the sum of number of large and medium sized Pizzas baked on Fr...
What is the difference between the number of Junior and Senior employees in the IT division?
A shopkeeper bought 120 kg of sugar at ₹40 per kg and 150 kg at ₹30 per kg. If he sells the entire quantity at ₹45 per kg, what is his total profit?
Find the ratio of the total number of employees in company D in March and the total number of employees in company C in August.
The number of 2 BHK flats in apartment R is what percent of total flats in apartment P?
Average of unsold pens of shops B, C and E is 290. If Red pens of E which were unsold was 124 than find the number of Black pens which were unsold.
What is the number of females working in A, B and E together?
