`40%` of M is 600 more than `25%` of M. Find M.

The income of A is 40 % more than that of B. A got a 25% rise in his income and B got a 40% rise in his income, then the percentage increase in the combined incomes of A and B is : A की आय B की आय से 40% अधिक है | A की आय 25% बढ़ गयी और B की आय 40% बढ़ गयी, तो A और B की संयुक्त आय में प्रतिशत वृद्धि ज्ञात करें |

25% of a number is more than 18% of 650 by 19. The number is

if 20% of a and 40% of b is 230 and 40% of a and 20% of b is 190 ,then b is what percentage more or less than a ?