Question

If 40% of children like ice-cream, 45% of children like chocolates and 45 children like biscuits, how many total children are there? ​

Answer 1

Answer:

45+40%of x+45%of x=x

45+40/100x+45/100x=x

45+2/5x+9/20x=x

45+8x+9x/20=x

45+17x/20=x

45=x-17x/20

45=20x-17x/20

45=3x/20

x=45/3*20

x=15*20

x=300