X’s income is 3/4 of Y’s income, and X’s expenditure is 4/5 of Y’s expenditure. If X’s income is 9/10 of Y’s expenditure, find the ratio of X’s savings to Y’s savings ?
Choose the correct choice:  A) 1 : 2  B) 2 : 1  C) 1 : 4  D) 2 : 3  E) 3 : 2
Let X’s income be 3k then Y’s income is 4k.   Let X’s expenditure be 4g then Y’s expenditure is 5g.   But 3k = 9/10 (5g) or k = 3/2g   X’s saving/Y’s saving = (3k - 4g)/(4k - 5g)   [3 (3 / 2g) - 4g]/[ 4(3 / 2g) - 5g] = 1/2   X’s saving : Y’s saving = 1 : 2   1 : 2NSWER:1 : 2
<result>A</result>
X’s income is 3/4 of Y’s income, and X’s expenditure is 4/5 of Y’s expenditure. If X’s income is 9/10 of Y’s expenditure, find the ratio of X’s savings to Y’s savings ?