Question

u need to have genius mind for this

Answer 1

4) 150+75+150+200=575

Answer 2

w- water melon
b- banana
g- grapes


4g= 1000
=>g= 250

w+500= 500
=>w= 0

2b+0+250=500
=>2b= 250
=>b= 125

Now,
grapes +1 banana - grapes * watermelon

= g + b - g * w
= g+b - (g*w)
[ As per BODMAS ]
= 250 + 125 - (250*0)
= 375 - 0
= 375


Hope it helps
;)