Limin Supermarket delivered 90 cases of pure milk, and the yogurt delivered was 40% of pure milk. The supermarket sent *** 126 boxes of pure milk and yogurt.

90+90*40%= 126 cases

A batch of parts, a ***300, completed (180), and the rest accounted for 40% of the total. 360-360*40%= 180

A barrel of oil, pouring out 60% is exactly 18 kg, and this barrel of oil weighs (45) kg? 18/( 1-60%)=45

If number A is 90% of number B, then number B is greater than number A (10)%1-90% =10%.